I have a Panasonic G1 with the original 14-45 kit zoom lens and I shoot RAW and use LR 4.2. For the most part I am happy with this combo but the low light performance is not that great. ISO 400 and above shots exhibit a bit too much noise for my tastes. I was looking to finally upgrade my body to a G5 for better low light performance. I want to get relatively clean shots up to at least ISO 1600. I do have the 20mm f1.7, but it gets little use because I just prefer the convenience of zoom lenses, so I was also considering upgrading my kit zoom lens from the 14-45 to the new 12-35 f2.8 zoom lens. I like the fact that it's a constant aperture since a lot of my shots are in the 25 to 35 mm focal range. So for slightly better low light performance in the ISO 400 to 1600 range, what would be the best short term upgrade: the G5 or the 12-25 f2.8? Ideally I'd like to get both, but I can only afford one right now. I would consider one of the new Oly bodies but I just prefer Panasonic's ergonomics and UI for some reason (plus I prefer having a built-in flash). The new GH3 looks too big for my use--the G5 is about as big as I'd like to go.