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i think the lundahl is better quality than hammond, at least from symmetry point
Still have my Frankenstein Stax 507/z565/normal bias and they are still the best headphones I have ever heard. Several times I have heard 009/Blue Hawaii, various 007 with 300b or Cavalli amps, Abyss etc at shows, and these strange 507 DIY still sound better to me, I don't know why. 009/Blue Hawaii too dry albeit detailed, 007s too soggy. Older Orpheus sounded great, but not as incisive. Dynamic models like Senn 800 a bit rough, even with tubes. I really liked the Abyss headphones, heard them five times, but they just don't quite have the speed/texture of the Stax 507 rig.
I am sure the Lundahl opts are better quality than the Z565 Dynas, but the Z565 sound quite excellent to the point I am not motivated to upgrade. However, I would probably encourage anybody to go for the best quality transformer they could afford.
I currently have been using the Frankenstein Stax 507/Z565/low bias with either Wavac SET or a 20 watt class A VFET Pass inspired amp. Best combo of tone, texture, space, detail, drive, bass etc. in a headphone to date that I have heard. It's probably why I am no longer that interested in headphones that much except to listen to them at shows etc. They are kind of magical in the way they hang the sound images in space, and manage to be revealing without losing tone, texture or body. I have a couple of sets of good dynamic headphones for casual listening in different locations, but the Stax 507 setup is the only one that challenges my high end speaker setup for general listening quality. I got a set of Sony MDR Z7 for casual listening, and I enjoy them, great headphones, but still eclipsed by Stax rig.