To my ear Momentum does not have recessed mids. Definitely not more recessed than the M50. The Momentum will also be better in imaging, detail, and most other categories from my memory of the two headphones. I would not consider the M50 analytical at all, more like a fun headphone itself. The Shure 840 will be more "analytical" than the M50 due to its more detailed and neutral sound.
Oh and by the way, are you talking about the normal momentum or the
on ears version because they sound fairly different. I'm describing the normal version. The normal version sounds a lot better balanced than the on ears.
If you are after a really impressive home headphone that is very easy to amp, very detailed, expansive and doesn't break the bank, I would be suggesting the Audio Technica AD900x. But if you are desperate for a closed headphone that is quite neutral, comfortable and is under 300 etc I'd be recommending the A900x by the same company. Not hard to amp at all either of them.
Other one to consider is
Fischer FA-003
Which you can get a re branding of called Brainwavz HM5 (a lot cheaper) - one of the best value closed headphones and perfect for home usage. Not sure if you amps are enough, but they sound
decent even unamped. Neutral, non fatiguing, decently detailed and very comfortable.
Yes, that's what I'm trying to say. The momentums are more bass-centric for casual, on the go listening. Because of my IE80's I have been given the impression that all Sennheiser headphones are Bass>Mids>Treble. That's excellent for casual listening but your ears will get tired fairly easily. For my home use headphones I wanted something that focused more on the mids than anything else. Like a pair of Shure headphones but the M50's caught my eyes because of its design and its raving reviews of the best price to quality ratio.
Not true. Most Sennheiser open headphones are focused on Mids mostly and some have very detailed treble. The HD800 their flagship for example, has one of the most neutral balances of all time, and possibly the most detailed headphone you could get. The HD600 is mid centric.
The momentum and a few other phones they make have been trying to get into the mainstream consumer market up against stuff like Beats, Sony and others. Many of the audiophiles companies have made bassy phones for this market. This goes against the grain compared to most of their open backs.