I definitely think it is an improvement. To me, I would kind of compare Young’s cinematography on Solo with some of Gordon Willis’ work, the cinematographer of The Godfather (who was also known as the prince of darkness). I know it seems odd to compare a cinematic masterpiece like The Godfather with Solo, but they both rely heavily on diegetic light to inform the lighting on set, and both films result in a lot of shadows. Also, both films deal with the underworld of their respective universes, and Lucas and Coppola were close companions and collaborators (with Lucas even filming some insert shots for The Godfather as well as doing some uncredited editing work), so I think the comparisons are appropriate.
But, if you actually watch The Godfather, yes the film is dark, but the parts of the scene that are exposed to the light are clear. With Solo, it feels like the Colorist put some kind of filter on that made the movie darker in the worst way possible. Yes, you want the darks to be dark, but you want to have what is lit to actually stand out, so you have a decent contrast. Good job one what you’ve done so far.