Sorry, didn't have N3 with me today Roland is putting out of business everything. Well, better late than never.. i guess
I still love N3ap. It has such a fun signature. The N3 bass is so delicious that there is no way M9 with BA bass is an upgrade. M9 has more treble than Roland but the quality of the Roland treble is on another level! Roland has less bass as well but that bass is more accurate, more natural, balanced.
N3 treble is very very good! It's my 2nd favorite treble after Roland. That magnesium twitter delivers smooth, forgiving extended treble which I prefer even to Z5 one! (Z5 has magnesium super twitter too, but additional BA twitter IMO messed up the treble)
IMO N3 is a masterpiece that outperforms it's price range on many levels. If you want something more natural, go for Roland, Roland has better, very realistic soundstage that not only delivers depth but also can give a cue of distance, room size.
I don't like the fit. I attached silicone wings to N3 and wear them over the ear. Roland is near perfect fit and isolation wise.
If you are satisfied with the fit and love the signature, then I'm not sure $1K upgrade is worth it.
Roland is more accurate, N3 - more fun
. I like having both. Roland has Less bass, Less treble, but acoustic music sounds so real on it. I'm listening to N3 right now and don't miss Roland all that much. Don't rush