When first introduced the fact that the G system and the Zeiss lenses might actually be as good or better than some Leica lenses was a matter of great controversy and discussion, and even still is sometimes. I'm both a Leica (MP, M2, IIIf, CL) and long-time Contax G user (G2) and feel both have strong positive aspects but many did not have the patience or the inclination to use or figure out the G system and its focusing. Or it just did not gel for them. Using a Leica and a Contax G is very different. But once it's dialed in the results from the G lenses are truly astonishing. Personally I use the Leica system mostly for the older lenses and B&W work with the 50/2 Summicron DR being my favorite pretty much for opposite reasons I like the G lenses. I love the more moderate contrast and more classic look of the DR and other older Leica lenses (I love my uncoated 35/3,5 Elmar for example), while the strong contrast and almost 3-D look I get from the G system 45/2 Planar and 28/2,8 Biogon work well for B&W its very different and for color the results simply knock my socks off. Some say the modern Leica lenses are cooler in resulting color and G Zeiss a little warmer.
Just be ready for some possible need of patience to get to the point of being comfortable getting the most out of the system. I'm 100% in the "it's worth it" camp but many others were not and left the G system with a real attitude of "good riddance!" and were not shy about shouting it loudly on the forums..
Hope it's all good for you. Please let us know.