I really have to take issue with this. I realise that this is an aesthetic matter and pretty subjective, but I've been surprised at how realistic the rocky planet surfaces do not look in ED.
I think this relates more to FD needing to heavily nerf planetary textures since 2.1 launched due to performance issues than anything else. The original Horizons textures we got with 2.1 were excellent but there were severe issues with texture pop-in to the point that most mid-range (and even some high-end) rigs were only rending the textures at extremely short distances. It wasn't an issue of GPU capabilities for many players as my rig had a mid-range card and was using only very modest graphics settings that should not cause problems (670MX with 3 GB DDR5 at 1600x900). Due to all the issues players were having they heavily "downgraded" the planetary textures and now they run much smoother with very little texture pop-in but the quality of the textures is almost a full generation out of date and they are nowhere near the photorealistic textures we originally had when 2.1 launched. Hopefully FD will fix these to provide a better balance between texture quality and performance but at the moment we have rather sub-par texture quality when approaching planets.