Compared to the HD545 and the HD600 I have to say, that the HD595 (50 ohms version) is not able to sound better to my ears.
Having listened hundreds of hours with each of them, I still prefer the HD600 over the HD545 which, on the other hand, I prefer compared to the HD595.
The HD595 sure has a good midrange sound but its bass is to unprecise while its highs are to flat.
OK, the HD545 has a all about flat sound compared to the HD600, but it's more analytic than the HD595.
The Vienna Philharmonic Orchestra (taken a good recording of them, like for example "Eine Alpensinfonie, Richard Strauss, conductor: Christian Thielmann, label: Deutsche Grammophon, SACD") only sounds together with the HD600 NEARLY like they sound live in concert sitting in a first category place.
With the HD595 they really sound like sh** ... uhm... I mean sitting behind a wooden wall.
Conclusion:
The HD595, for which I've payed 100 Euros, are not worth the money.
Stay away from them, if you want to listen to classical music.