I bought my GX7 as my first foray into m4/3. I enjoyed using it but found the relatively low frame rate (I use multi-shot a LOT) and viewfinder less than ideal. The VF is okay but it's slow to respond when bringing it up to my eye and while it's got great ergonomics and I much prefer the Panasonic menus to the Olympus menus, I'm debating selling the GX7 to make way for a backup or secondary body to my E-M1. I'm considering either a used E-M10 or E-M5. I do shoot professionally but not full-time. I use my E-M1 for sports, portraits, and events. I've used the GX7 with good results in studio settings but I'm just not entirely sold on the Panasonic sensor look or the UX of the camera in general. The "natural" choice for a second body would at first glance seem to be the E-M10. But the weather sealing of the E-M5 might be desirable as well. What are your suggestions regarding a backup or secondary body to an E-M1? Does the E-M10 work better because it matches the E-M1's frame rate in continuous shooting and stabilization (I know there's a difference here but it's much closer to the E-M1 than the E-M5 or even GX7 AFAIK)? I mostly use primes but if I used a zoom it would be on the E-M1. I like to have two different focal lengths at the ready in my ThinkTank Retrospective. I plan on somewhat expanding my legacy MF lens collection as well (probably Canon FD like my wonderful 50/3.5 macro) so the focus peaking is probably also a huge advantage of the E-M10. I'm selling off everything I can to make way for the Oly 40-150 and this second body. Then I will be fully m4/3 and MF film (Mamiya RB67).