I finally took the SF standard (couldn't bring myself to splurge on the Pro) and Q4 TAC to a range recently to have a quick side by side comparison. The perceived recoil of the SF was significantly less, I'd say on par with the recoil of Q22 (which I already upbraided myself for not bringing to a shootout for more comparison options). Q4 was definitely more jumpy. Also, because of the "fatter" grip of the SF, it feels more round and, for me, fuller. Frankly, compared to the grip of SF, Q4 TAC and PPQ M1 grips feel more like Glocks - same feeling of squeezing a 2x4 in your hands (if such blasphemy can be allowed here)
