Basically, S-AF with 4/3rds lenses seems to be on par with the E-5. Also, the camera has a feature to calibrate all of its PDAF points individually for different lenses. It seems like the slowness they noted might have to do with outdated lens technology when compared with M4/3 lenses. Perhaps most importantly, however, DPR now seems satisfied with tracking and C-AF performance. They used the M4/3 60mm macro and had no complaints about tracking performance, giving some samples too. Signs point to it being the case that tracking works best with M4/3 lenses, likely due to a smart combination of PDAF *and* CDAF. Not that it's bad with the old lenses, just the new lenses are better.