Japanese consumer electronics major Sony is reportedly planning to launch the company's 2015 flagship Xperia Z5 series in India next week.

The company has begun sending out invites to media outlets for an event on 21 October in New Delhi.

"Block Your Date," reads the invitation (courtesy, BGR India), but does not give away any hint on the significance of the event. However, it is widely reported that Sony might release the new Xperia Z5 series in India, which is due for launch since the official unveiling in September.

Last month, Sony pulled the wraps off three new Xperia Z5 series -- a premium model, a regular flagship and a compact variant -- at the internationally acclaimed consumers electronics trade fair (Internationale Funkausstellung Berlin) 2015.

For the uninitiated, Xperia Z5 Premium is world's first smartphone to boast 4K resolution display. It features 5.5-inch screen with a staggering pixel density of 806 ppi (pixels per inch), thus guaranteeing ultimate video viewing experience than any other smartphone in the market.

Under-the-hood, it houses Snapdragon 810 processor, backed by 3GB RAM 32GB inbuilt memory, high-capacity 3430 mAh battery to power the high-resolution display. The company claims that the phone can run for close to 2 days with single full-charge. It also boasts QuickCharge v2.0 technology as well.

The 5.2-inch based flagship Xperia Z5 model too features pretty much same internal hardware seen inside the Premium model, and the only difference is that it packs 2900 mAh battery.

On the other hand, Xperia Z5 Compact is the smaller of the above two models and comes with a couple of changes in terms of RAM (2GB) and battery capacity (2700 mAh).

All three boast state-of-art 23MP camera with Sony Exmor RS for mobile sensor, Hybrid Auto Focus 0.03 sec, 5 x Clear Image Zoom and a wide-angle 5mp snapper on the front. [Detailed camera details below]

Key specifications of Sony Xperia Z5, Premium and Compact:

Models Sony Xperia Z5 Premium Sony Xperia Z5 Sony Xperia Z5 Compact
Display 5.5-inch 4K UHD (3840x2160) display with Triluminos display for mobile, X-Reality for mobile, Dynamic Contrast Enhancer technology
  • Pixel density: 806 ppi (pixels per inch)
5.2-inch full HD (1920x1080p) display with Triluminos display for mobile technology
  • Pixel density: 428 ppi
4.6-inch HD 720p (1280x720) display with Triluminos display for mobile technology
  • Pixel density: 323 ppi
OS Android 5.1 Lollipop (guaranteed to get v6.0 Marshmallow update) Android 5.1 Lollipop (guaranteed to get v6.0 Marshmallow update) Android 5.1 Lollipop (guaranteed to get v6.0 Marshmallow update)
Processor 64-bit Qualcomm Snapdragon 810 (MSM8994) Octa-core CPU 64-bit Qualcomm Snapdragon 810 (MSM8994) Octa-core CPU 64-bit Qualcomm Snapdragon 810 (MSM8994) Octa-core CPU
GPU Adreno 430 Adreno 430 Adreno 430
RAM 3GB 3GB 2GB
Storage capacity 32GB, expandable up to 200GB 32GB, expandable up to 200GB 32GB, expandable up to 200GB
Camera Main: 23mp camera with Sony Exmor RS for mobile sensor
  • Hybrid Auto Focus 0.03 sec 
  • 5 x Clear Image Zoom

Front: 5mp camera with Sony Exmor R for mobile sensor

  • Full HD video, SteadyShot with Intelligent Active Mode – video stabilisation
  • Wide-angle lens (25 mm)
Main: 23mp camera with Sony Exmor RS for mobile sensor
  • Hybrid Auto Focus 0.03 sec *
  • 5 x Clear Image Zoom

Front: 5mp camera with Sony Exmor R for mobile sensor

  • Full HD video, SteadyShot with Intelligent Active Mode – video stabilisation
  • Wide-angle lens (25 mm)
Main: 23mp camera with Sony Exmor RS for mobile sensor
  • Hybrid Auto Focus 0.03 sec *
  • 5 x Clear Image Zoom

Front: 5mp camera with Sony Exmor R for mobile sensor

  • Full HD video, SteadyShot with Intelligent Active Mode – video stabilisation
  • Wide-angle lens (25 mm)
Additional Main Camera features Up to 8x Digital Zoom, Wide-angle G Lens (24 mm), Up to ISO 12800 Photo / 3200 Video, SteadyShot with Intelligent Active Mode – video stabilisation, 4K video recording, Pulse LED Flash Up to 8x Digital Zoom, Wide-angle G Lens (24 mm), Up to ISO 12800 Photo / 3200 Video, SteadyShot with Intelligent Active Mode – video stabilisation, 4K video recording, Pulse LED Flash  Up to 8x Digital Zoom, Wide-angle G Lens (24 mm), Up to ISO 12800 Photo / 3200 Video, SteadyShot with Intelligent Active Mode – video stabilisation, 4K video recording, Pulse LED Flash
Battery 3430 mAh;
  • up to 2 days under mixed usage
  • QuickCharge 2.0 technology incorporated
2900 mAh;
  • up to 2 days under mixed usage
2700 mAh;
  • up to 2 days under mixed usage
Network 4G-LTE Cat 4/ Cat 6 (depending on the markets) 4G-LTE Cat 4/ Cat 6 (depending on the markets) 4G-LTE Cat 4/ Cat 6 (depending on the markets)
Add-ons Finger-print sensor, PS4 Remote Play, Waterproof and dust tight (IP65 and IP68), Bluetooth v4.1, A-GPS, Wi-Fi (MIMO), MHL 3.0, NFC, FM Radio Finger-print sensor, PS4 Remote Play, Waterproof and dust tight (IP65 and IP68), Bluetooth v4.1, A-GPS, Wi-Fi (MIMO), MHL 3.0, NFC,FM Radio Finger-print sensor, PS4 Remote Play, Waterproof and dust tight (IP65 and IP68), Bluetooth v4.1, A-GPS, Wi-Fi (MIMO), MHL 3.0, NFC,FM Radio
Sound system High-Resolution Audio (LPCM, FLAC, ALAC, DSD), DSEE HX, LDAC, Digital Noise Cancelling, Clear Audio+, S-Force Front Surround, Auto-headset compensation, Stereo Recording  High-Resolution Audio (LPCM, FLAC, ALAC, DSD), DSEE HX, LDAC, Digital Noise Cancelling, Clear Audio+, S-Force Front Surround, Auto-headset compensation, Stereo Recording High-Resolution Audio (LPCM, FLAC, ALAC, DSD), DSEE HX, LDAC, Digital Noise Cancelling, Clear Audio+, S-Force Front Surround, Auto-headset compensation, Stereo Recording
SIM (Type: Nano) Said to come in both Single-SIM and Dual-SIM models separately Said to come in both Single-SIM and Dual-SIM models separately Said to come in both Single-SIM and Dual-SIM models separately
Dimensions 154.4 x 76.0 x 7.8 mm 146.0 x 72.0 x 7.3 mm 127.0 x 65.0 x 8.9 mm
Weight 180 g 154 g 138 g
Colours Chrome, Black & Gold Graphite Black, White, Gold & Green Graphite Black, White, Yellow & Coral