If I have to be honest that's the second bike I've ever tried so I'm not really able to tell you how the frame perform to be honest. I can tell you the differences between this and the two other bikes I have but it wouldn't be a fair comparison I think
Nothing to be honest.. I found a difference when I switched to carbon wheels. After that for sure I noticed less flex behind but it's more in the wheels. With carbon wheels I don't feel any type of flex