I'm already looking forward to High School Football this fall and I'm in the middle of a transition from Canon APS-C to m4/3. I haven't sold my longest lens and 7D body yet (frankly, been afraid to). I've gotten some really great results during track season with the new GX7 and the 25mm PanaLeica. The frame rate on the GX7 is not considered fast enough for sports but I started sports shooting years ago with a Canon AE-1 and T-Max pushed to 1600. A little pre-focusing and situational awareness goes a long way. I've been looking at longer options for m4/3 and see the logical choice: the 75mm 1.8. Fast focusing, sharp, etc... I plan to pair it with the E-M1. I'm also open to the 4/3 50-200mm which is, by all accounts, an excellent optic but I'm a little worried about native AF performance with the 4/3 adapter. I understand it to be much better than it was but not sure where it stands in comparison to my 7D + Sigma 50-150mm (which is not really comparable to the L 70-200 but gives great results if used properly). So my options for the coming fall seem to be (all assuming an E-M1): 1) Oly 75/1.8 crop and up-rez with a good algorithm 2) 4/3 50-200 + MMF-3 no crop but iffy AF performance 3) 4/3 prime + 1.4x TC least desirable I cant' find any TC's for m4/3 so I assume none of excellent quality exist. Since an Oly 150mm 2.8 would be awesome but isn't appearing until 2015 from what I understand, my only "real" option seems to be the 75mm 1.8 and a good crop + resize. Has anyone gone this route out of necessity, given there's a famine of long tele's in the native m4/3 mount? FWIW- Up-rezzing is actually quite good now if you haven't tried it in a while. Modern algorithms do a fine job and, given we often add things like vignetting and simulated film grain to the final images anyway, potential magnification of imperfect details seems like less of an issue than it was a few years ago. The 75mm seems to offer such sharpness that it seems likely to posses plenty of detail for crops down to 8MP anyway. My own tests with the GX7 and Panny 25/1.4 seem to indicate that, while blown highlights are disastrous to m4/3, I have plenty of ability to crop given people rarely wants prints larger than 8x10. Once in a while I'll get one that someone wants blown up more than that, but those are rare. Be interested to hear thoughts on up-rezzing m4/3 RAW files and any practical examples you have that show the effects. If no one has any, I might be tempted to write a blog post about it and see what I can come up with.