I’ve spent the past few days flying around the alps of Switzerland and Austria. Switzerland seems to be a complete triumph - very precise and detailed DEM - the high pass roads such as Grimsel and St Gotthard now have fairly realistic level roadbeds and switchbacks rather that looking like something taped to the side of the slopes. The photo imagery is very clear and high resolution, with realistic colors (mainly), and few noticeable tile boundaries - probably the best large terrain area in MSFS. You can even see a decent representation of the nearly vertical north face of the Eiger.
Austria is a different matter. The DEM is good, but a few notches below Switzerland. It seems that much of the terrain imagery west of Salzburg has been updated and some of it looks as good as Switzerland. The photo imagery to the east including a large part of the Salzkammergut and the mountains to the south has not been updated at all. This was a real disappointment since the botched areas are some of the most well-known and beautiful regions in Europe. Much of the area is covered in snow or is autogenerated fill-in because of cloud cover on the original photos. I realize that it might be difficult to acquire photography of the highest quality and resolution for every area, but it would be better for the sim if MS/ASOBO temporarily used a significantly lower photo resolution with the correct summer season and colors that matched the good neighboring areas.
PS - I’ve tested these observations both with and without any addons. I did not use developer mode.