Upload & Sell: On
Phillip, I had 5D II, 24-70L, 5N. From my experience, I could never get the colours from it that I could from my 5N and great glass. No way. The 5N has better native colours, the 24-70L isn't especially good for colours.
So, what to do?
First, and it comes free, I would get away from Adobe when it comes to RAW processing. I always used DPP, the free Canon software. The development part is very weak, but the RAW processor is IMHO significantly better than Adobe's. So, develo pin DPP, convert to TIFF, develop your TIFF in LR or CS. Of course, you can try and develop in DPP as well, if you can live with the reduced flexibility and options it gives you.
Second, and it is close to free, get another lens. There is one I have in mind that has great colours and sharpness, and cost pretty little, and can be resold for the same amount in 6 months. Contax C/Y 50mm f:1.7. I have not used one myself, but have seen enough pictures recommending it. It has a rendering that I feel is one you could like.
Hope this helps.