i think kojima team's ace members are the cinematography/effects/imagery people. see the facial models are certainly not bad, but its those effects people that make the package look much better than they are.
if you'll check out some RE4 character shots (and i dont wanna get involved in a screenshot battle), you'll notice that the hair is much more detailed.
as you can also notice, in MGS, the ears are showing polygonal edges, in RE4 they are more rounded.
but overall look of the shots you posted, the "warm" glow, the shallow depth of field (blurry backgrounds), overexposed parts of the face...these are the effects that make the whole package look tremendous, to the extent of hiding the lack of detail in the faces.
props where its due, kojima's effects/artistic team...they got great aesthetic vision. unless of course its the same guys doing the modeling as well, then they balanced everything to achieve some great results.