Hey Jorgen, if it does foliage well, I might seriously consider mft!!
35-100 is small you say? Let me check.
Best.
There's not much foliage in my photos (Louis must be more of an expert in that area, since his birds for some reason tend to spend much of their time in trees), but my guess would be that it's very well suited for foliage at f/4-5.6, probably also f8.
At 357g, 99.9mm length and a filter size of 58mm, it's really the tiniest high grade 70-200mm equivalent you can find.
Four Thirds | Micro Four Thirds | Products(Lenses)
As for body, I would choose one from Panasonic to get dual IS. That's very useful for us old guys. You find the best viewfinders in the GX8, G9 and GH5. The GX8 offers the smallest size and weight of those three but should be used with electronic shutter most of the time to avoid "shutter shock". The G9 is the perfect machine, but bigger and the GH5 the video makers dream, although it does make nice photos too.
The outsiders are the GX9, with the extra grip if needed, with better image quality than the GX8, but not as good viewfinder, and the G85 with its excellent ergonomics. Similar viewfinder to the GX9. All have fully articulated LCD except the GX9 that only offers tilt.
Compact Camera Meter
Edit: Both the GX8 and the GX9 need the extended rubber eye cups for their viewfinders, but those are available from Panasonic or through eBay sellers.