I do consider that you have either used different filters or some unmatching source with them.
I indeed have not had PMV A-01 MK2 but all the reviews I have found on the web are opposite to what you wrote. They mention that these IEM are sibilant and bright.
Also you may check TWINACSTACKS message several pages ago and he mentions that Magaosi K1 have dark sound signature. While I would not call them dark but they are nowhere close to sibilance or harshness. It simply is not there and I am very sensitive in that matter because I hate bright IEM and really like good mids which are upfront and energetic.
However I'd also like to mention that I have had Super Audio 6 which you have in your signature and I will take Magaosi K1 over this 6 BA Universal anytime because they are simply better.
Also even though I may call Super Audio 6 quite "relaxed" they are nowhere close to being natural as their tonality is simply wrong. They are not warm nor bright they are dull. This is very strange that you praise these IEM which are quite overpriced and so straightly negative about Magaosi K1 which have much better price peformance ratio.
I believe you need to double check if you have the genuine one - there should be a K1 Sanhoo written on it's shell. Also I suggest you try white filters and stock eartips which you should move closer to earphone shell and make a deep insertion so there won't be any space between eartip and earphone shell.
Contrary to a lot of you here I payed full price both for Magaosi and for Super Audio so I am not advertising. These are just my honest impressions.
http://imgur.com/5FoZXxs