I have a hexar AF, but have not tried the G2.
Personally, I love the Hexar, but I think that its finder is over-rated. At least on my example the frame lines seem dim. Like others, I've on several occasions thought of selling the hexar in order to raise cash for, say another M lens, but I alway have stopped myself because the Hexar lens IS SOOO GREAT, I would go so far to say that it is better than the type 4 summicron that I've used.
The Hexar also fills a certain niche, namely, AF for when you want it (I find it useful for photographing my fast-moving small kids) and super quiet (also good for the kids as they tend to ignore the camera), and things like school performances where loud shutter sounds would be rude/distracting. The hexar also has the advantage of not saying "Leica" on it, so people don't know its a good/expensive camera.
As far as the 1/250th shutter speed limitation, I have been annoyed by that on occasion mainly due to the fact that I tend to use very fast film, especially in the winter here in Scandanavia, so on the occasional bright sunny day I'm stumped. Furthermore, the hexar's lens is most beautiful in my opinion at around f/2-2.8. Therefore, in my IDEAL world, I would have two Hexars, one with Neopan 1600 and one with FP4+ or Plus-X. I tried using a 4X ND filter, but it's a bit fiddly as the meter is not reading through the filter.
Good luck with your decision making.