eckaThe lenses you mentioned are not really "tele" lenses
"because there are no small CSC tele lenses without huge compromises in IQ"
I would dispute that claim Olympus & Fuji both make very good and high IQ lenses for CSC cameras. Lenses like the Olympus 12mm f2 ED, 60mm f2.8 ED, 75mm f1.8 ED, Leica 45mm f2.8 in micro four thirds or the Fuji XF 27mm f2.8 all perform excellently.
Well, not the 12mm, but taking that crop factor into account, current primes get you to the equivalent of 150mm (I would add the 45mm Olympus to the list), with very high image quality. As for Micro 4/3 zooms, they tend to compare quite favorably with their dslr equivalents and are, of course, much smaller and lighter.
Well, for me, the cheaper m4/3 output is not good enough to choose it over a good P&S camera or two, or three (G1 X, RX100, RX10) and the expensive one just makes no sense.
150mm on FF is a short telephoto, nothing powerful really , just like anything else in 100mm to 200mm range. So, for m4/3 it must be 100mm+.