yea it is definitely going to take time getting used to the controls,especially after playing and beating Dead Space,I am so used to being able to manuever and run while shooting,you can't do that in RE5,this is a pretty big let down,but I guess none of them would let you shoot and move,so I just have to get used to it again.
for me anyways it is hard to tell the difference in pic quality,they pretty much look identical,so I have no idea why the size difference.