I think elves should look different indeed. Because in 5e, they are inhabitants of the Feywild and should be distinct in terms of appearance with the races of the mortal plane, even more so than they used to be in previous editions.
And I agree, the tieflings are the best non humans looking in the game right now. Larian managed to give them a kind of unique appeal and sexiness which befits their devilish origins.
