I just purchased a 1968 M20G, I consider it to be the most utilitarian plane that Mooney every built. Roomy cabin with the lowest cost systems to maintain that Mooney built. I am liking it so far. I’ve actually never flown in an F so can’t give you a comparison of the 2 models. Many say the g is the slow Mooney but mine seems to average 140 to 145 knots with quite a few speed mods, climb has been more than adequate. I think the biggest downside to the g is the lower useful load generally. The gross weight is actually lower than a C with the extra weight of the mid body. My useful is 850 - someThing I may try to work on in the future.