I gotta say, out of all the likenesses, Egon's was the best. Technically Slimer's was the best, but of the humans, Egon's was most on target. Unfortunately on mine the Glasses are a bit skewed, and it's difficult to get them in the proper place. Egon is also the one with the most accessories, since he's the one packaged with the Ghost Trap.
The four are also packaged with Santa hats. There are actually 2 types of this set out there. One where the hats are already placed on their heads, and one where they are not. Slimer is placed in the packaging differently in both, but the contents of the boxes remain the same. If you can find it, and you want the hats on, get the one where they come with them on already. It's a bitch to get it on some of their heads. Winston's the easiest. Again, it's a pretty good likeness.
With Peter we're getting into tricky territory. The likeness isn't as great, the feet do that weird Mattel feet bend thing, and the hat is a bitch to fit on. (It's hardest on Egon.) Peter looks vaguely like Bill Murray, you can kind of see the similarities, but it's not anywhere near a dead on simulation. Also, I've posed Peter with Wonder Woman to show that these figures are clearly in the Movie Masters scale of the Mattel 6 inch line, which is a wee bit shorter than the DCUC figures.
And then there was Ray. Poor, poor Ray. It looks the sculptor really hates Dan Aykroyd. That's the only reason I can think of for why Ray looks like he's missing a jaw.
Also Slimer, which you saw in the background of the Egon figure. For $60 it's nice to have some larger Ghostbuster figures, but on the whole, I wish they could have all been the same quality as the Egon and Winston figures.