Rand, I had the same initial observation using both an OM-5 and a Z8. After processing several side by side tests I have found that the Lens Softness Corrections (sharpening) in PR5 at standard = 100% is equal to PR4 at soft = 75%. But there is a big jump in PR5 from standard to strong = 150%. So, be careful with the adjustment slider as it appears to be non-linear.