I have both the Muhle R89 Grande and the R41 Grande. I love the heavyweight handles. They are both nice razors. Since the R89 is moderate on the aggression scale, I use it with very sharp DE blades. The R41 is definitely more aggressive with greater face feel, but it is by no means a "beast" unless you have poor technique. I have very sensitive skin and have no trouble using the razor with mid-sharp blades. The R41 is so efficient that the I feel no need to use the very sharpest blades, even with my tough beard.
I have not tried the earlier version of the R41. I understand that it was far more aggressive than the current version.