I'm a little late to this thread, but it's great to see that Amir measured these!
I ended up buying a pair of M105 about two months ago. I think these are really impressive speakers, but I do think that equalizing the 5k peak is almost a necessity. The overall character of the speaker really does change in my experience. It goes from a speaker that perceptually has a little too much upper midrange energy (combined with a hint of bass over-ripeness and a lack of top end-air) to a speaker that is very neutral.
I think this subjective impression actually aligns pretty well with Amir's measurements, too. Without EQing the 5k peak, I find that it doesn't really sound like the red line below... it's actually closer IMHO perceptually to the green line I drew below, which tracks the overall FR more closely than the red line Amir drew:
The green line's slope is a little less steep, which suggests a more upper-midrange emphasis in-room, and the frequency extremes end up a little unbalanced comparatively.
I'm not being critical -- once you EQ it to remove that 5k bump, I think it tracks the red line Amir drew very well, and they're quite wonderful.