Never really noticed much difference in terms of detail, etc. between them the main difference really is the treble presentation - from my experience the older 600s have a more raw sound versus the smoother sound of the 650s but its not as pronounced with my 2013 ish 600s.
For me its comes down to the 600s just sounding right for me over a broad range of different music types and I have a fairly wide taste in music while to my ears the 650s excel at some music types but aren't as to my tastes as the 600s with others (if I was less lazy I'd probably swap between them depending on what I was listening to but with my newer 600s just not enough difference to bother with that).
The main difference with them really IMO is about how you enjoy the music not which one is the better headphone.
For me its comes down to the 600s just sounding right for me over a broad range of different music types and I have a fairly wide taste in music while to my ears the 650s excel at some music types but aren't as to my tastes as the 600s with others (if I was less lazy I'd probably swap between them depending on what I was listening to but with my newer 600s just not enough difference to bother with that).
The main difference with them really IMO is about how you enjoy the music not which one is the better headphone.
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