Correct me if I'm wrong, but all variations of SP-01 come with rubber grips from the factory. And they do feel better than plastic especially when you shoot and your palms get sweaty and slippery abit.. Considering all 'for' and 'against' and smallish price difference between the two - 85B and SP-01... SP-01 seems as a winner to me. Again, your milage may vary.
And if you are wondering, I do have SP-01 Tactical and am very happy with it. If it didn't exist, I'd go for 85B or 75B (in Canada).
I'm not trying to convince you or anyone to get one but to get a closer look at it as it's one of the best out there and was the best for me personally.