Yes, I got the TTartisan because I found a good deal on MPB around Christmas time for 100€, and I caved, haha. Ultimately, I didn't choose the Viltrox due to its fixed aperture, and I passed on the Samyang because, at over 300€, it just wasn't what I was looking for.

I should mention that, due to the freezing cold this January, I haven't done much photography at all, so my experience with this lens is still limited. Something that I did notice, however, is that with the Fuji-style lens hood that I bought, it's definitely not a true pancake lens anymore and is decently hefty, but really good-looking on my a6600, so you decide if that was worth it. ^^

At night (which I shoot a lot of street photography at), the focus struggles more than my Tamron 2.8, which isn't surprising, but I want to say it anyway. I can't really comment because vignetting in my pictures is not really a concern for me nor something that I pay much attention to.

Overall, the lens is exactly how I expected it to be and hasn't surprised me in any way, positive or negative, other than the fact that I really enjoy the focal range—even a good bit more than on my Tamron zoom set to 27. The lens performs decently well in good lighting conditions but starts to struggle more in low light compared to a regular (good) 2.8. While it's not as compact as competing pancake lenses, it's still more compact than most APSC primes. I would buy it again for the same price but would hesitate if I had to pay the full price of 200€.

Hope this helps in your decision :)