Disclaimer: After this review was published we received an email from a third party (not HTC) saying that our HTC One sample was not running final software. We have contacted HTC's UK PR team to find out when the final software will be available and what changes it will contain, and will update the review when we have this information and have tested the handset with the new software build.
We encountered no problems with functionality or performance when testing the handset.
Last year it was 720p, now Full HD 1080p screens are becoming the norm on top-end smartphones
This difference was borne out in our subjective web browsing tests. Both phones rendered graphics heavy web pages at a similar speed, but when zoomed in and panning around a web page, the Xperia Z would stutter when coming across a large image – a problem we didn’t have with the HTC One.
Luckily, HTC has provided a huge 2,300mAh battery to power the fast processor and bright screen. The handset managed 8h 32m in our continuous video playback test, which is a strong result and bodes well for all-day battery life.