No, I didn't mean, that the scene should be brighter. Not at all! But at least to me the shadows look equally bright and a bit flat, and I had the impression that there is a second lightsource (maybe with shadows disdabled) in the scene, which is something that's quite common here, but I think it always looks way more unnatural than adjusting the "natural" factors, like the (one!) sun and environment light plus the GISD settings.