Upload & Sell: Off
Every P&S I've looked at is a compromise in some way. I'm sure I'll find things I wish they did differently as well. Being a Nikon user for DSLR's, there are already differences in user interface I have to deal with. However, all my P&S's are Canon (save for a cheap Fuji I received as an award at work and never use.) Canon just got these right, so they are hard to argue with.
I think the limiting factor for me will be the focal length. While close focus is an issue for some, it will be the long end I will have problems with for concerts. I have yet to have seats at a concert where close focus distance was going to be an issue. I recognize that big sensor does create some lens limitations if the camera is going to stay a reasonable size. Still, a 4X zoom is a bit short for the primary application I'll be using it in. I'm just not aware of another camera around this size that would do the job better.
In the end if the G1X has what I need to get decent shots at the concerts I go to, then I would be happy with it. Since they stopped allowing "professional cameras" into concerts, it has been difficult to get reasonable shots of the bands I see. I have struggled with high ISO noise in P&S cameras for as long as I've had one, and it sounds like the G1X has found a way to deal with that. I'm willing to give it a try.