Hi Alex I agree with most of them but slower CPU is not true. Actually everywhere I read people talking that Atom is 25% less powerful than Tegra.
One is ARM one is x86 so it is a little harder to compare, but generally the Atom in the Mi Pad 2 gets over 2x on benchmarks like Antutu vs the Tegra. This is mostly just for CPU, you may be right about the GPU being better (better for android anyway, not on the Windows side as it wouldnt run windows at all)