That's the thing that has had me going about the comments on Forrest while Calkins gets a free pass art-wise?
Granted, I recently saw some later Calkins Sundays with Buddy and Allura and comparing them with earlier pages when Buddy first meets Allura, it's like night and day. Wonder if it was a natural evolution of Calkins or if it's simply the heavy use of ghosts. I don't know enough about the strip to be sure.
I think everyone falls short when compared to Alex Raymond but the difference in style seems to enhance some of the stories, e.g., Calkin's bizarre ray guns and space ships, Crane's shadows and depth, Foster's detail.