I see some replies here are of a pretty special photographic point of view.
In case you are looking for allround lenses for general purposes, i.e. for stills and video, preferably with the same body, I found the smaller and lighter options of MFT a big relief.
After having carried around 400/2.8 and 4.0/600 primes for years (wildlife stills & video) I am enjoying (as an example) the combination of a quality body like the Pana GH5 with the Pana/Leica Vario-Elmar 100-400mm/4.0-6.3 fully satisfiying.
The weight being almost a 1/10 of the former and the picture quality, especially video quality matching the heavy full frame equipment in most (95%) cases.
