I had the same curiosity and have the Utopia! However instead of going to the Phi I went with its little sister the V2!
It definitely has the Abyss sound especially for the low end, expanded sound stage and detailed highs. It's not detailed as the TC but much much more portable. I'm using them on the Cayin N6ii A01 & iBasso DX300 DAPs and it sounds fantastic! Definitely unlike those flawed measurements
When I added the Romi Audio BX-2 Plus portable class A Amp that generates more than 5 watts per channel at 32 Ohms to the mix, the Diana V2s really sing. It's a wonderful, portable experience.
As for the Utopia comparison, the Utopias are definitely faster, has better transients and more detailed. The V2 have a much much better low end, wider Soundstage, similar imaging and less fatiguing treble! Oh and the build quality is definitely premium on both but I find myself loving the Dianas more.
No fit issues for me and the pads were comfortable, but I'd recommend going for a headstrap pad for the Diana, I will try to link the recommend pad which costs around $10 USD from Amazon to alleviate the small hotspot that might appear on the top of your head after long listening sessions.
Edit: Found them:
Abyss recommendation:
https://www.amazon.com/gp/product/B07G4BQC1B/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1
Head-Fi recommendation:
https://www.amazon.com/gp/product/B07NP9KLDL/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1
All in all, the TCs are still king but they have a wonderful sister that you'll lose the track of time while being with her, 30 minutes will easily turn into 3 hours!