Yes, that's me. I really appreciate your extensive review, and the unexpected behavior with the original version of the Sigma 30/1.4 is certainly something I need to look into. The new version of the 30/1.4 is a really nice lens, BTW, and even though I only bought it for Speed Booster testing I'll definitely keep it since 21mm f/1.0 is really nice on m4/3.