It seems we have the same headphones and very similar tastes in music OP! I largely agree with your review but have a few notes I would want to add for anyone interested in an HD58X. I listen to mine with a DIY Objective 2 AMP so my experience may be slightly different from OPs.

1. The included cable is trash, I have had a ton of problems with mine. It's far too long for my taste, made of poor-quality rubber, and I constantly have to fiddle with it to get it working properly. This wouldn't be a huge issue except that Sennheiser uses proprietary headphone connectors so making a DIY cable as I usually do is quite difficult.

2. OP describes the sound stage as "OK" while I would go as far as saying it's downright underwhelming. The soundstage is barely wider than most closed-back headphones I have tried, and as someone who often struggles to find a quiet listening environment, I often reach for my Sivga or Sony headphones which have only a slightly smaller soundstage and the benefits of being closed-back.

Still good headphones, probably the best-sounding pair I own especially in the imaging department. OP has very much made me want to purchase a DAC instead of using what is built into my PC with their remarks on KDA and Itzy, two of my personal favorites.