My impression of Impossible Burger v1.0 was that the pinkish/uncharred bits had an odd sweetness and moisture/texture that made it most distinguishable from a beef burger. With 2.0, the texture is a bit more firm and beef-like, and it seems they've put less emphasis on the 'bleeding' which I think has reduced the sweetness as well.

I had a notion that I intended to test with v1.0 that it would be more convincing if you charred the hell out of it and made it more like an overcooked burger, however I never did test it, and I also read that it didn't perform well (fell apart, etc) if too overcooked. However, I did really like the flavor and texture of the most charred bits of the burgers I did have.

I really liked it. At medium doneness, it was like really soft ground meat, and had a pretty beefy flavor, but perhaps a little bit sweeter. I found myself wanting seconds after I finished my burger.

I should note that I have never tasted V1 so I can't compare the two.