rhema83 said:There is much more to a lens than weather sealing, though. Are you implying that the 12-50 is optically comparable to Canon L / Nikkor gold-ring / Zuiko SHG glass?
Call me a skeptic but I think most m4/3 lenses rely too much on firmware-level correction to make up for their optical deficiencies. For example, the "premium" M.Zuiko 12mm f/2 ED exhibits 5.6% barrel distortion when uncorrected, an abysmal figure compared to EF 24mm f/2.8L II (1.4%) and Nikkor AF-S 24mm f/2.8 G ED (1.5%). Even the 4/3 Zuiko 12-60mm f/2.8-4 ED SWD, with all its compromises to achieve a 5x zoom range, exhibits only 2.3% at its widest end.
The proof is in the pudding. You can talk about the specs until the cows come home, but at the end of the day, it's the photos that count.
There is also no doubt that Olympus can produce the finest lenses, perhaps only second to Leica. But to produce a12 mm f2 prime with near perfect optics, the lens might be end up being too big, too long, too heavy or too expensive.
As we have all seen, it's how they balance all the features.