T5p 2nd gen
Already got 75hrs of burn in, and starting a more critical listening now... So far I hear a very resolving dynamic sound with an excellent separation/layering and neutral tonality. Detail retrieval is close to a micro-detail level yet not grainy or analytically-harsh. Low end extends down to sub-bass (nice quality texture with a rather polite quantity), and a tight articulate mid-bass punch with a fast attack, but not as much slam. Bass is well controlled, no spillage into lower mids, accurate, and balanced. Lower mids have a nice body which adds just a touch of warmth to the sound. Upper mids are leaning more toward smoother analytical level (the best of both worlds), not too bright or too harsh. I'm very impressed with clarity and details in vocals (both male and female) with an organic hint of smoothness. There is absolutely no sibilance or metallic sheen. Treble has a good extension, a nice detailed sparkle, crisp definition, zero piercing or offending frequencies, and a polite level of airiness. Definitely great for an extended non-fatigue listening sessions.
Soundtsage is 3D holographic, the expansion is way above average for a closed back headphones in all 3 directions (width/depth/height). Imaging literally has 3D placement of instruments and vocals with an excellent separation and layering effect. The angled Tesla drivers create like a virtual surround space, quite unreal for closed back headphones.
Sound isolation is good, not the greatest. I actually improved it a bit by bending the headband more to create a better clamping force. Unfortunately, sound leakage is real and I wouldn't recommend you taking these to your local library. It actually failed a "wife" test sitting next to my better half on the couch

Obviously, these are not open back or semi-open back, and it becomes less noticeable 5-6ft away, but closer and you will hear them. I tried pressing earcups with my hands, assuming maybe it's a leakage due to pleather earpads - still the same. I'm pretty sure the sound is leaking from two large (5mm) vents, one on each earcup next to the pivoting hinge where the part of the yoke connects on the back. By taping it over, I noticed a slight reduction in sound leakage.
I love the fact that cable is removable. The stock cable is high quality, but contributes to a noticeable microphonics due to its textile coating rubbing against my cloth. I have TWag v3 modular cable, and already got extension for T5p 2nd (connectors are just regular 3.5mm TRS), and I have to say that retrieval of details scaled up with this pure silver cable, sound became a little brighter and more analytical, and in some songs it even got closer to sibilance threshold. If you want more analytical crispier sound - pure silver cable does wonders, but if you prefer a little smother and more organic tonality - stay with a stock OCC copper cable (7N purity).
In terms of pair-up with different sources, you can drive T5p 2nd from any source with authority! This is a truly portable headphones. It paired up great with PAW Gold and X7, more analytical bright sound. With L5 Pro the sound is very detailed with a warmer low end and more bass slam. Sounds great with both X5ii and X3ii, though sound was a little less dynamic and soundstage shrunk a bit. I also enjoyed how it paired up with my Galaxy Note 4, though sound was a bit warmer and less resolving, but with HA-2 (in high gain) it scales up significantly with a smoother detailed sound. As a matter of fact, Note 4 + HA-2 and L5 Pro where two of my favorite pair ups. Also, T5p 2nd is not just great for a mobile pair up, it's actually very comfortable to wear on the go. Earcups are not "earmuffs" huge, very comfortable, and don't have in-your-face exotic look. Because they don't fold or rotate, they are not as comfortable to wear around your neck, but comfortable to wear on your head. I just had them on for over an hour without a break, and my ears still feel cool.
So far I'm VERY impressed!!! Full review to follow soon!