In my very short experience with them, yes. 

Yeah, these graphs look about right. The ridges at 5K and 10K bothered me over time. I was used to them, so Grados weren't that bad to me when I first got into this hobby.

These were my daily headphones for about 3 years while I was in college. Once I got into other headphones I stopped listening to these. I busted them out for an evening a couple of months ago, and my reaction was like purrins -- "odd".

I remember them sounding thin and bright and there was other weirdness too but I coudn't get too flowery without another listen. 

It seems that a dip around 200hz or a bit higher is responsible for a lack of warmth in a lot of phones. 

Maybe Sony changed the V6 at some point to be exactly the 7506? Tyll's V6 and the unit I measured look like totally different headphones. I know the measurement methods are different, but everything else looks different too.