The M8.2 framelines are sized for a 2M distance, which results in a photo very close to what you saw in the finder, except at very close distances. The M9 has framelines sized for 1M, which is most accurate at short distances; at greater distances, there will be more in the picture than in the finder frames, resulting in unwanted 'NO SMOKING" signs, "NO LEFT TURN" signs and telephone poles.
The M8.2 has the sapphire glass LCD screen; the M9 does not.
A 28mm lens gives a useful 37mm equivalent. A 21mm lens gives an accurate 28mm field, used with an accessory finder. And if you can see the framelines (eyeglass wearers need not apply), the M8.2 has a 24mm frameline, no accessory finder needed--and you get a 32mm equivalent FOV.
I guess the 47mm equivalent with the 35mm lenses is acceptable, if not particularly exciting. The 67mm equivalent of the 50mm lens is hard to know what to do with. Portraits, I guess.
To me, the inability to manually enter the lens choices is a worse deal-breaker than the crop factor.
I agree that the current used prices are incommensurate with the value of the M8.2 when compared to the M9.