That RAF is an old X-Trans detail torture test that's been around for some time. I think I first saw it over at DPR. It get's used a lot as an example of ACR/LR's "watercolor" effect.
Flysurfer's LR 6.1 rendition is I believe as good as you're going to get from ACR/LR. This recent update doesn't seem to make of a change to the X-Trans fine detail demosaicing from Adobe.
Here's a version of that file demosaiced using DCRaw (Raw Therapee) for reference.
fall_clr.jpg