Some people think moaning is a profession. I prefer to try to figure out how to use something and make it work for me. The results are better.
I have to shoot at some tracks from 45 to 600mm, mostly 45 to 300mm. At one event in 2016, I had to shoot at 14mm because I couldn't get further away, but that is unusual. I used the 14-150, could have used the 12-32 Panny, Maybe I did use the 12-32, can't remember.
Usually I can position for a prime, shoot distance/ angle, change to a different prime if I wish when I have what I want, and want to try something different, or switch to a zoom. Because I usually have good light, the main advantage of a zoom is if something happens somewhere else like a spin that is too close or too far for the focal length of the prime but could be quickly captured with a zoom. If I shot for the Associated Press I would buy any kit I needed, but that's too much like work.
I regret missing some opportunities, but I love shooting with primes because of high IQ, fast glass, low weight, small size, all the MFT virtues.
I have no problem mixing brands. I owned the G2, G3, G5 before buying EM-5 and following with several PENs. I liked all the Panny's. I like the G85 A LOT. Love the grip, handling, value. A good deal for the body, a great deal with the kit lens. It's a dual IS kit. I might go that way. I'll need more Dual IS lenses. - What am I saying? I don't need Dual IS. the G85 fits me well, love the way it handles, has everything I need. IBIS with any lens is better than I need.
I have the 75-300II. I like it but it is too slow when the light dies and I'm shooting 1/800 to freeze the action. ISO shoots up to 1000-1600 and detail and IQ is degraded. I need to use the OLY FT 50-200 + TC f2.8-3.5 on a tripod for that. I already own it with the MFT adaptor. Great optics, slow and heavy, but I can pre-focus and MF. Results are excellent.
I have no problems with focus. I shoot everything in AF-S, get the same results in MF. With the 50-200 I have to pre-focus. Its easy. Subject movement is predictable.
Yes I meant Panny 12-32. I have the OLY 17 f/2.8 and the Panny 20 f/1.7, Sigma 30 and 60 f/2.8, OLY FT 50 f/2, MFT 45 and 75 f/1.8. Some of these lenses are too fast. I have to use an ND filter to widen the aperture to get the DOF I want because I often pan race cars as slow as 1/30. Even at ISO 200, the lens stops down too much. Sometimes the background looks good at f/14 - f/16 when the car is moving fast. I've used f/20 with good success. Depends on a lot of things, speed, distance, what I'm trying to do. I like to be able to use f/5 any time, anywhere I want it.
I did not find the Panny 45-200 IQ good enough for my taste. Sometimes good, sometimes not. Maybe it was the body. Last used it on a G5. Its gone now. Maybe I didn't know how to use it properly or didn't have the skills at the time. Sold it.
It's easy to buy a lot of gear you don't need. I have some. Professional critique convinced me I can improve more with more knowledge of how to make the best use of the gear I have, than by purchasing better gear. I have recently seen great images out of fossils like Canon 40D and Nikon D90's with average glass. I was amazed when I learned which kit made them. That convinces me that the latest and greatest and most expensive gear is not what I need to make better photos. You don't make a better jump over 5 feet by being able to jump 10 feet when 6 feet yields the same result. I only need faster glass.
I know I need faster glass on gloomy days between 75 and 300mm and it would be nice to have it between 45 and 300mm in a zoom. I know I can't have the latter in one lens but the 35-100 f/2.8 would cover a lot of it and the 75-300 is decently fast up to 175-200mm. Most people think of the 75-300 for shooting it fully extended. I use it that way, but I also find it quite good at the short end. Very good at the short end. If I can position myself to use it between 75 and 150-175mm the results are quite good.
OLY refurbished my EM-5 under warranty even though it was out of warranty because they had no parts and made me wait almost two months for the repair. It has a new shutter and gear mechanism with just a couple of test shots on it. I have a grip for it. Cosmetically perfect, not a nick in it, the camera could pass for open-box. Hard to kick it to the curb.
But I like the grip of the EM-1 for longer lenses and the higher resolution LCD and EVF, especially when I use magnify to focus a lens manually with the EVF. It is for those reasons I am thinking about the EM-1. I don't need CAF, or tracking. IBIS, even 3-axis in the PL/7, seems to be good enough. Very few photos are not sharp enough for my purposes. Those that are not, are so far off because I screwed up so bad, NASA doesn't have a camera that would fix that.