It is indeed the color temperature and light source; the back-ground is diffused by the trees in the back, but the light comes down at an angle and some direct like gets through, but this is mostly -- but not all -- diffused by a large line of evergreens. I did increase the exposure -- I generally underexpose in the "post-k5-era" and especially with the porcelain skin. But then pull down the highlights and add contrast.
The 2nd one I think does have saturation bumped a little; I hadn't really looked at the one much, and I think it could less of it perhaps.
At sunset, it provides a great backdrop. During the day, it's a like big blob of greenish black blob with because everyone is well lit and the background is not.