I bought this book along with Imaginistix and III Millennium. I don't think I can compare Luis Royo with Boris Vallejo. They have different styles, both very appealing in their own way.
Between Imaginistix and Twin Visions though, I would choose the latter the only reason being its slightly bigger size. Other than that, and after owning several books by Boris Vallejo (besides the ones mentioned above I also have Mirage and The fabulous women of), it's pretty much safe to say that it would be very hard for me to be disappointed with his work.
It's easy to tell which paintings were made by Boris and which were made by Julie. The ones made by Boris have a darker tone and Julie's finishing methods aren't as thorough which leaves them a little less clear. I guess what I mean is that sometimes you can compare a Boris painting with a photograph while that would be much more difficult to happen with a Julie painting.
As a comic book fan and not an art expert (as most of you have already guessed) to me this is indeed superior fine art. It's a treat for the eyes and I often find myself flipping through it.
SPECIFICS:
Page Count: 128
Number of images: 114
Small images: 4
Half page images: 22
Full page images: 80
2-page spreads: 8
BW images: 0
TEXT:
2 pages - Introduction
5 pages - Chapter introductions
Comments on the paintings
ART:
8 images: 5 stars
54 images: 4 stars
47 images: 3 stars
5 images: 2 stars
0 images: 1 star
Overall: 4 stars