35mmc published their 7artisans 28mm f/1.4 M-mount lens review - here is their conclusion (the lens will be priced at £375 without VAT, or around $480 - for comparison the Leica Summilux-M 28mm f/1.4 lens is $6,595):
David Thorpe:I bought my first Micro Four Thirds gear 8 years ago. Since then I’ve used nothing else. With the big hitters like Nikon and Canon – even maybe Panasonic – jumping on the bandwagon now with full frame mirrorless models, has Micro Four Thirds had its day?
UPDATE! I say in the video that I have put a link to an interesting comparison between FF and Micro Four Thirds print performance – YouTube won’t let me do that, I find. The link is to The School of Photography – https://youtu.be/OGn3yPl59ZM