So in my challenge to start using Karma / Solaris more in Houdini I went and did some cloud tests one a cloud I modeled back for the guitar project. Same scale height and settings as close as I could get them. Karma volume settings are just default, no changes. I had to tweak the Redshift Standard Volume Shader a good deal to get it this far. Rendered both out at 1920x 1080. The Karma one looks more like a cloud though while the Redshift one still feels more like smoke to me. Karma on left, Redshift on right. Using Houdini 20.5.410 and Redshift 2025.1.1.