Impossible, at least to me, is functionally indistinguishable from a ground beef patty. Back when I was vegetarian and before I was vegan, I went to Burger King on lunch to try the Impossible Whopper. I wasn't fond of Burger King, but I was mostly curious enough to see what an Impossible Burger tasted like having had Beyond at home once (where Beyond is pretty easily distinguished from ground beef by its flavor).
Walked in, walked out, took a bite in my car. Straight-up almost went back in and asked for a new one before realizing it wouldn't do any ethical good and that I didn't have the time. This was even after seeing that it was in the Impossible-branded wrapper. I decided to go there another time to "try the real one", and it was the same. I was dumbfounded; it was straight-up just a Whopper – having admittedly not eaten a BK burger in a few years at that point. (They also put mayo on it by default without telling you, so good job, BK.)