I've just sold my old and trusty 50-200 ED (non-SWD). It has been a good lens for me, but I'm finding the AF just a little slow and noisy compared to the more modern native u43 lenses and I want to start doing some more wildlife photography. So, I'm now thinking what to replace it with. The obvious options are: - 40-150 f2.8 plus 1.4 TC. Super sharp (at least without the TC), but limited in reach. - 300 f4. Super sharp, but it's not a zoom. - 100-400 f4-f6.3. Seems a nice lens, but probably not as sharp as the Olympus lenses and pretty dim at longer focal lengths. Thoughts?