Advice needed for next purchase

You have a nice kit of gear there. Before you spend more money on MORE gear, you may want to do an assessment of what you are looking for that your current gear does not give you? Unless you know what you are looking for, and why, then you are just going to be spending money without necessarily optimizing your returns....

Given that, I would ask yourself:

1. What are my most frequent shooting situations (low light, night, portrait, wide angle, scenery...)?
2. With the gear I have now, what do I find I can't do that I want to?
3. Do I find I am always looking for a particular lens, or focal length that I don't have now?
4. What are the most consistent problems I am having (blur, focus, noise)

If you can narrow down what you DON'T like with your current kit, and what you most want to improve, then you will be able to figure out what equipment will be most likely to fill the gaps you have now in your system. If you just go and buy more stuff because it is supposed to be "better", then you are not necessarily making the wisest use of your money....it would have to be better enough in an area that is important to you for it to make sense to buy.

Since you like the ergonomics of the G5, then my suggestion would be to look into the GH3, if you wanted a better performing sensor, or to wait for the G7 to come out. I am assuming that Panasonic will put their newest sensor (the one in the GX7) into the G7, and if so, you will have a real update of your G5 while keeping the form factor that is most comfortable for you.

In terms of lenses... the 14-45mm is a very good zoom, but is not fast. If you find you want to use your zoom in lower light situations, the 12-35mm might well make the most sense as an upgrade. Again, this depends on your useage....

Don't get caught up in a good case of G.A.S.....evaluate your needs and purchase your next gear based on what you actually will get the most use out of, rather than just to find a way to spend the extra $ that you have at the moment.

-J