If my Fuji X10 didn't have such surprisingly good low-light quality, I might have regretted getting it just before the Canon G1x was announced. For the G1x is pretty much the same camera as the X10: high quality, compact, all-round camera. But the G1x has a larger sensor, larger than M4/3, and so in theory it probably has yet better available-darkness powers.
But then it's bigger and heavier (530 grams vs 360 grams, big difference), and it's sort of brutish looking. :-)
Ah, and the Fuji, no doubt helped by the smaller sensor, does have one clear advantage: its zoom is much faster, F:2.0 to F:2.8, as compared with the Canon's much more limited F:2.8 to F:5.8. Particularly at the long end where you need all the help you can get, that's a two-stop difference! (I think Fuji has the record in zoom speed.) ("Speed": how much light a lens or sensor takes in per second.)
Still, doubtlessly this is a very powerful all-round and travel camera.