Hardware
HTC One M9 packs a 5" 1080p display - the same unit from One (M8) - Super LCD3 - with minor improvements on the technology and color rendering. The highlight of the front are the traditional BoomSound stereo speakers, now improved further by Dolby Sound technology.
HTC One M9 in Pink and Gold
The One M9 is powered by the latest Qualcomm Snapdragon 810 platform - an octa-core 64-bit processor with four Cortex-A57 cores at 2.0GHz and four Cortex-A53 working at 1.5GHz. The new Adreno 430 is responsible for the graphics, while the 3GB RAM will help with the multi-tasking.
The rest of the specs include 32GB expandable storage and rich connectivity package with LTE Cat.6 or Cat.9 (various by region) with support for 21 LTE bands, wired and wireless TV-out, GPS + GLONASS, Bluetooth 4.1, NFC and Wi-Fi ac.
Camera
HTC has dropped the dual-camera tech in favor of a Toshiba-made 20MP sensor with a 1/2.3" sensor size. HTC One M9 comes with a 20MP BSI camera on the back with F/2.2 aperture and dual-LED dual-tone flash. The maximum shooting resolution is 5376 x 3752 px – that’s 10:7 aspect ratio. RAW capture is supported, as is 4K video recording.
The HTC One M9 rear camera
Unfortunately, the camera doesn't support optical image stabilization, but on a positive note there is a sapphire glass to protect the lens from scratches.
The front selfie camera uses a 4MP UltraPixel sensor, quite similar to the one embedded on the backs of HTC One (M7) and One (M8), but without auto focus.
HTC has developed new cooler effects for the rear camera and promises a brand new Zoe apps for Android and iOS.