As I said above, I'm keeping the Fuji. On the downside I never warmed up to the xtrans idea.
I am somehow mentally prepared for the noise in m43, after all it shouldn't be worse than my RX100 which is decent. There is no alternative in Fuji for smaller weather sealed zooms, particularly in the telephoto area. I hope I'll be able to put up with the fiddly buttons on the E-M5 or the articulated screen (I prefer the tilt only). I'm excited though about using the live preview, high resolution mode or touch to focus/shoot.
As for a wide angle lens I'll wait for the DL 18-50 to come out and if it's decent it will serve double duty, wide angle lens and backup.
Hi armand,
You are worrying too much. No system is perfect but it actually seems as though m43 will be a good fit for you. To get its full measure, you have to embrace what it does, not what it doesn't.
The Oly in body image stabilization system (IBIS) yields about four stops advantage when hand-holding a shot. That is true of prime and zoom, alike. You are right that subject movement is still a problem. The only option is to increase the ISO and the shutter speed. As I wrote before, ISO 1600 is still excellent and ISO 3200 is good, both with NR adjusted in the raw converter. Noise will be more of a problem if you don't give full exposure when you increase ISO. The solution is to expose to the right. I most often bias the exposure +1. Sadly, I have seen experienced photographers on this forum bad-mouth the IQ because despite their years of experience they don't understand how to use their histogram.
As I wrote before, I find overall IQ better with either the E-M1 or the E-M5ii than I got with the Canon 5Dii. It's not a little better; it is quite noticeable, better color, better highlights, no banding.
The E-M1 is still a viable option. Ergonomically, it feels great in hand (except for the off/on switch) and the rear display tilts, as you prefer. The E-M1 body-grip is more pleasant than on the E-M5ii. If you go the E-M5ii route maybe consider adding the battery grip. I use an L-plate on both my Oly bodies and I think that does not play well with the battery grip.
Finally, regarding lens speed, there really seems little difference in the offerings for m43 and Fuji. Considering that Panasonic and Oly lenses work interchangeably, there is great flexibility. For example, if you want a fast prime there is the Pana-Leica 25mm f 1.4, a really sweet lens for street shooting and portrait work. The Oly 75 mm f1.8 prime is considered to be exceptional. There are really fast lenses available from Nocticron and Voigtlander, f0.95!