I recently bought a second M8.2 (mint used) rather than an M9. This suits my needs, irrespective of costs, considering my shooting style and desired print sizes. I was happy to also get in the process a sapphire LCD, top display and an even quieter shutter than the M9(marginally)... although none of this of consequence in IQ, of course.
The filters went on once and have never been a concern since (and based on what I've seen, even better blacks in some cases compared to the M9 without filter).
The crop factor has also become a non-issue as I generally use a 28 Summicron Asph on one camera and a 50 Summilux Asph on the other. In my film days (M6s and M7s), I instead preferred using my 35 Summicron Asph and 75 Summicron Asph. All these lenses are wonderful, so no real sacrifice in my choosing either pairings. In fact, I never liked the 75 frame lines, so the M8.2 actually provides better viewing for me than my FF choices.
I also like 'second generation' cameras in general. The kinks have generally been well sorted out, and the prices have been typically less than complete new models. It will be interesting to see if an M9.2 materializes, but even so, I'm still likely better off with my current set-up given my shooting style and preferences.
Others naturally have different needs or wants, and for them the M9 may be clearly superior. To each their own. I welcome choices, and am always open to options if they can better meet my needs.
For the OP, the M8 is good option to gain experience. Once you use it for a while, you'll be better able to determine what, if anything, you're missing based on your needs and preferences. But, if you can find a reasonably priced M8.2, perhaps even better. FWIW (probably not much), it will always be a rarer camera than either the M8 or M9.
Jeff