Aside from the fact that you have to build the Evolution, here are the major differences that I see:
Evolution is pressurized.
Evolution is all composite; until the U & V are approved, all Mooneys are aluminum but will soon have some composite.
Mooneys still have the steel cage around the cabin, Evolution doesn't.
Evolution stalls at a much higher speed.
Approach speeds are tremendous in Evolution.
Evolution has very high wing loading.
I used to know someone who had a turboprop Evolution. Watching him zoom around the pattern and fall towards the runway like a rock was a sight to behold. He only got stopped on the 3000' runway using beta thrust. It is not a pilot-friendly plane, and I'm sure it is much less stable than any Mooney. Sounded cool taxiing in, mixing that turbine whine with the funky noise the prop made going from normal to beta thrust and back again. I am supposing that the piston version won't do this, losing many, many style points and lots of ramp appeal.
I'm not much of a fan of the swoopy fuselage design, though. It looks wrong, and the back seats look cramped. Big, bulbous front windshield area, and a stick for a rear fuselage, then a tail. No balance, like a tadpole with a stubby, narrow wing. But you know what they say about the beer holder . . .