HTC chip-set of 1.2 dual core and andreno 220 is far more better that SGS2's 1.2 dual core and 2008's Mali-400 chip-set. I used both the handsets and now using HTC Sensation after SGS2.
The main problem with HTC is it's locked boot-loader and it's stock rom which is really not ready to use the full power.. The power is not equally distributed. Benchmark is not everything as sensation has issues with sense 3.0 and better pixels than the SGS2. Below is some link where you can understand the whole technical issues.
http://xdaforums.com/showthread.php?t=1050968
http://www.differencebetween.com/difference-between-mali-400mp-gpu-and-vs-adreno-220-gpu/
http://xdaforums.com/showthread.php?t=1169376
The main problem with HTC is it's locked boot-loader and it's stock rom which is really not ready to use the full power.. The power is not equally distributed. Benchmark is not everything as sensation has issues with sense 3.0 and better pixels than the SGS2. Below is some link where you can understand the whole technical issues.
http://xdaforums.com/showthread.php?t=1050968
http://www.differencebetween.com/difference-between-mali-400mp-gpu-and-vs-adreno-220-gpu/
http://xdaforums.com/showthread.php?t=1169376
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