Just tried the M3 with my 50 F1.4 and 16 - 35 F2.8. Sad to report that the AF is significantly slower on M3 as compared to M2. On the M3, it takes an average of 1.5sec to lock the focus on 50mm while the 16-35mm takes less time to lock, rendering it useless in real life. This is a far cry from...