Ok to break it down EVO 7,8,9 are all using the same platform CT9A. Difference?
EVO 7 is the new 'base' design for future EVO(8 & 9), its slightly less powerful, slightly slower, heavier & not as good handling as EVO 8 & 9.
EVO 8 is upgraded EVO 7 with better everything. Brakes are Brembo, shock absorber are Bilstein, lighter wheel & overall lighter weight than EVO 7. Result is faster & better to drive than EVO 7.
EVO 8 MR is an upgraded EVO 8 with even better Bilstein absorbers, even lighter wheels, 6-speed gearbox, lighter aluminium roof for lower center of gravity, a better LSD & a much more advanced traction control & stability control system. Some version even come with more power.
EVO 9 is again an upgraded EVO 8 with the introduction of MIVEC for the 1st time on an EVO. A redesigned turbo to work better with MIVEC producing a wide powerband & also more power. EVO 7 & 8 around 280hp, EVO 9 produce 290hp.
EVO 9 MR is similar to EVO 8 MR, basic EVO 9 with brembo brakes, bilstein absorber, better traction control & stability control, lighter aluminium roof & lighter wheels.
In terms of driving experience (i have the privilege to drive the EVO 7 & EVO 8) EVO 8 is alot better than EVO 7, EVO 8 just has better traction, better brakes & overall more responsive than EVO 7. So i presume EVO 9 will be better & easier to drive (with MIVEC) than EVO 8 since its an EVO 8 upgrade.