Margiela GATs are probably the most comfortable sneakers I've worn, if I were to pick something to walk on for 10 straight hours, this would be it.
KVA is too wide even for me. Very clunky too. Now uncomfortable to the point my feet would hurt, but my foot can move around inside which can be annoying at times.
On the other end of the spectrum, Raf is pretty narrow but more comfortable than KVA.
Lanvins are pretty comfortable too, I could wear it and stand walking in it for hours. Wore it to Vegas before not much complaint.
For YSL, I only have the Rollins and it is still the flimsiest pair of sneakers ever, leather is paper thin. Good for lounging.