If you want to see some examples of figure skating shot with M43...
2016 Finlandia Trophy
2016 JGP Tallinn Cup
2016 Oberstdorf Adult competition
All shot using Panasonic GX85 with 40-150 f2.8 - because quietness and compact size are my priorities, so I don't disturb my neighbours in the audience. Or smack them in the face with a big-ass DSLR lens.
They're post-processed and reduced for web of course. Originals are all JPG-only. I'm sure people with some actual skill could do much better with the same equipment, RAW processing etc.
Image quality is of course not the best in absolute terms, but is actually way beyond my needs given I'm not a pixel peeper and nor is anyone I share with. I view at screen/web sizes, and don't print any bigger than A4. So from my point of view, a lot of the advice given above is worthless nonsense. Especially if given by people who haven't shot FS themselves and give no examples.
At Finlandia Trophy and Tallinn Cup, the lighting was pretty good: I used Shutter Priority 1/800th, which resulted in ISO's about 1250 - 1600. I could happily use my 45-175mm in such lighting, with slower shutter speeds and higher ISOs (useful backup given some venues don't allow lenses longer than 6 inches. It may even pass for a "fixed-lens compact" in places that don't allow interchangeable-lens cameras at all, if the security isn't too knowledgable).
Oberstdorf lighting was not so good, so slower shutter speed, 1/640th, resulting in ISO's about 2000 - 3200.
In even poorer lighting I could drop to 1/400th. I have plenty of practice with panning/action at that speed (and much slower) from shooting airshows - which requires slow shutter speeds to get blurred propellers, so theplanes don't look like engine failure. And actually, I
like getting a bit of motion blur on skaters' hands/feet at those shutter speeds... adds dynamics and drama... but that takes more concentration, keeper rate is lower, and I'm lazy these days ;-D
I don't find image noise a problem. If I'm going to share any photos, Neat Image cleans them up nicely in auto mode, after I made a profile for my GX85.
I went to the Trophee de France Grand Prix event last weekend with my new Panasonic G80... that has the same shock-proof and quiet shutter as the GX85, but it's
even quieter thanks to added EFC that works up to 1/2000th shutter speed. It also has much better EVF, and better battery life. Haven't uploaded any photos from that event yet, but I will do soon...