I'll agree- shoot it again. I too have M's & the G2, and after that M VF the G can be a disappointment in that department, but it has a real place in my kit. Flash work is so much simpler for me with the G, and lacking any M wide glass I find the 21 and 28 on there the most. I also like the G as a top-notch point & shoot of sorts- take it hiking, etc.
The lenses really are good, and the ZM glass is more expensive than the G stuff was. My G 90 outperforms the Leica one, and when I want something long I reach for that one the most.
I'm about to embark on a similar route that Joe has just taken, some re-alignment of the kit to better get what I'm seeing, but I can't see dropping any of the Contax gear except maybe the 35- the one lens I never really got into of the lot. Nothing can top the ASPH 'cron 35 for what I shoot.
I shot 810 for a long time, and when the RF became the way I needed to make the pictures I wanted I never once considered selling off any of that gear- I know I'll be back to it one of these days. Perhaps the closet is ok for a while, I'd suggest waiting a while longer- I know from experience that selling something can lead to regrets, and getting back into it can be a money losing proposition.