GH3 vs GH2 for stills

Hi, I have just got a GH2 on special and have a GH3 on order.

I need 3  bodies and deciding on getting another GH2 while still at a good price or saving up to get an extra GH3.

My needs are mainly good stills and looking at getting into a bit of video for real estate in the new year.

The stills will be a mix of commerical, portraits, school photos and the odd wedding.

What I need to workout .... Are the colours and images from the GH3 that much better than the GH2 that I should simply get two and use the current GH2 as the backup?

Or is it so close that it may be better to get another GH2 and the money saved go towards the 35-100 lens?

Pros and cons would be helpful thanks