I compared the Qutest a few years back when I was cross shopping the T2. Initially I found the Qutest to be very dynamic, but in repeated A/B it grew fatiguing to my ears on most recordings. I went for the T2 which I still own.
The T3 is a nice improvement. I ended up recently with an X1 which is absolutely fantastic and cross shopped that with the Bartok, preferring the X1. It is liquid and compares nicely when playing high res files against my high end Kuzma Stabi R vinyl setup.
Lumin customer support is second to none, and it works flawlessly to update. The Lumin app is good, but I prefer the interface of Roon.