I know there is no alternative to the 12-35/2.8 except for the fast 4/3s Olympus zoom but that costs even more money. I have the Olympus 14-42 and while I'm happy with its performance from 14-30, after that the sharpness really tails off. So, I'm asking, what is the next best lens out there for a lower price than the 12-35? I know Olympus and Panasonic make several in the range but I don't know which are sharp and affordable. I wish Sigma would make a fast 1.8 like they have for DSLRs. Thanks in advance!