12-35 unimpressive as a landscape lens

Think I'll wait and see whether Oly commits to a µ4/3 edition of the 12-60, which could really enhance the system (despite the existence of the 12-50). In practice it's a fine landscape lens and offers near-macro performance to boot. Very sharp, very contrasty. But big on a µ4/3 body and twitchy autofocus.

Has there been any evidence of 12-35 sample variation? I see some very sharp output, some not so sharp.

Cheers,

Rick