I’ll start with the Porsche 997, the 996 looked alright imo, but it looks “like a 90s Porsche”, the 997 made it look sleeker and more modern. Still looks good today.
As for cars that looked worse after a facelift? Maybe the facelifted 6th gen Camaro? The 6th gen looked great pre-facelift, but they did something weird with the headlights and now it looks so-so…
tesla model S: looked better after facelift
997.1/987.1 -> 997.2/987.2: looked better after facelift but idk if its a subconscious bias knowing the .2s don’t have IMS & bearing