The last time I had Vokeys were the original 200 series in 54.10 and 60.12. The 54* was great from bunkers or fairway and the 60* was actually really good from tight lies in spite of the high bounce because of the narrow sole and trailing edge relief.
Looking at the SM4's, I assume the 54.11 is the closest to my old 54.10, but what about the 60* wedges? The 60.10 M grind looks like it might reduce the effective bounce to less than the 60.07 S grind.