The redesign of the 85 has improved function in that the mags don't fall out and there is less bolt wobble. Not true CRF, IMO.
The mag falling out is a joke IMO. I never in all my years (first new Sako -m75ss 300WM in 1997) had an issue with the magazine. Hunted hard with and in weather from about +25 degrees C to -35 deg C. My good hunting buddy can concur as he bought the identical rifle at the same time I bought my first. I have over half dozen now.
At our moose camp we have 5 guys in Sako m75 rifles......no issues or lost mags. I will never buy the m85,but I also prefer the m75 monte carlo stock design.
To each there own.
As for other difference, Sako changed the "Action" sizing from the m75 series (I, II, III, IV, V, SM) to the m85 series (S,M, L, SM).
They also per say have a CRF