Re: Sports photography
Honestly, Sony has been hitting home runs in the last year or two. The A7 III is a great camera. The A7R III is an even better camera. They have a lot of great lenses, and this is no doubt another one.
But its a 5 figure entrance fee! I doubt we're going to see many comparisons between this $16,000 kit and a "mere" $4,500 E-M1 + 300. If you have the money, you spend it on the best. If you don't, you make do.
The main problem with m4/3 is high ISO performance. Sports professionals need to deliver clean JPEGs before the game ends, thus there is no time to post process. The high ISO performance of the E-M1 II is still around the same or lower than the Canon 5D. The original one, that came out in 2005. So I really have a hard time seeing paid professionals going back 10+ years on the high ISO performance in order to save some weight.
For enthusiast amateurs, we can of course do whatever we want. We don't need to deliver work. For me, the idea of a $16,000 camera and lens makes no sense - honestly, I don't see the difference between images from a $5k or $15k kit. But for others, the extra $10k is pocket money. I guess, what I'm saying is, its not an objective measure. The marginal added value is small and whether or not its worth it to you is a question of how much you're willing to spend
Olympus E-M1 Mk II
7.5mm f/2.0 - 17mm f/1.2 - 56mm f/1.4 - 9-18mm - 14-150mm II