Mike Lane (
) have compared the OM-1 with the 150-400mm with a Sony A1 with the 200-600mm. He says that the OM-1 has more out of focus images in a series than the A1, but it gives him more sharp images than the A1. Mainly because the OM-1 is shooting at 50 FPS. The ability to capture images before the shutter is pressed appears to be valuable.
Yes, IMO the biggest advantage of OMD/Olympus is the pre-capture facility which would be extremely useful for subjects where timing of the perfect moment can't be easily predicted (e.g. when a bird or insect takes off from its perch).
I really wish this feature would find it's way into FF cameras, but it requires very fast readout, large buffers, powerful processors and long-lasting batteries, so I don't think it's likely to happen.
I use FF cameras, but to be honest I think it's just a passing phase in photography. I think the future lies with smaller formats, which allow faster fps, in-camera focus-stack merging (as opposed to having to merge in post), and lots of potential advantages for computational photography. The limiting factor is megapixels. M43 can currently only get to 25MP and APS-C can only get to 33MP at the moment.
But I'm not getting into a megapixel or format discusion, as I've already done so several times....
People have *very* fixed ideas about which format, brand or megapixel count is "best"