I got rid of the 598 after a couple of weeks of lying to myself. They were my first ever openback headphones and they were so highly rated on amazon at the time. They sounded very warm and veiled. Gunshots in counter-strike sounded dampened like they were muffled. I remember someone saying they sounded like listening to music from behind a closed door, lol. They are also where I learned the term "sennheiser veil"
Interestingly the HD560S seem to be nothing more than HD598 with more neutral fundamentals below 1khZ to get rid of their warmth and a ever so slight bass extension, lol. I ended up replacing my HD598SE with Philips 9500s cause at least they had treble clarity and neutral fundamentals.
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