While it's true that a true photographic artist (I decline to use the term "pro") can use almost any tool with adequate results, it's equally true that those skilled in photography also have their preference for tools; such preferences are important enough that such persons make emotional investments in certain types, brands and formats that stick with them throughout their photographic career.
So I don't buy the bullsh*t about "the camera isn't important". Heck yea it's important! It's just not the end-all to your photographic choices, but rather the mere start of a lifetime of choices pertaining to photography.
In my mind moving to a place of increased skill in photography (what you describe as "better") requires that you learn control. Control of the tools. The tools being the camera and its associated peripheral equipment (filters, flash, etc.) and also what happens in the "development" and "printing" stages, be it film-based or silicon-based. In this respect, if you find that you lack the type of image control with the LX-3 that you desire, then it become logical to assume that it will eventually (maybe not today) become a hindrance to further growth. So you will eventually need to grow into a tool that offers increased control of the parameters of photography. The M6 you mentioned earlier could easily be that tool.
As could the GF1/20@1.7 combination. The reality is that, regardless of our fond retro-tech feelings for film cameras on RFF, you are eventually going to have to become skilled with the capture and processing of image files digitally, as that is the future. The GF1 is a good tool for learning these skills. It's JPEG output, for instance, is considered by many to be sub-standard to the E-P1 by Olympus, so you'll essentially be forced to learn RAW processing, whose results can be very good. The camera is compact and light (certainly lighter than an all-metal M6 with accompanying Leica or Zeiss lens) and the one focal length of the 20/1.7 will offer you the opportunity to learn to see with just that angle of view.
If it were me, I'd get the G1 instead of the GF1; but I say that as a biased person, currently owning the G1 and 20/1,7; the EVF on the G1 I believe will serve you much better as a tool for viewfinding the scene than the less adequate externally attached accessory EVF for the GF1.
One more comment about film photography with manually controlled cameras is that they can teach you a lot about the essentials of photography. I think you could get into a film-based camera besides the GF-1 for lots less than a Leica M6 and be more than satisfied, and still have a great opportunity to learn. I'm thinking about a fixed-lens rangefinder, to be had much less expensively then a Leica; or even a compact film SLR like an Olympus, and use both simultaneously.
Good luck, and whatever you do, don't lose your passion for creating images.
~Joe