I used to shoot a 5DIII with Canon L glass.
Now I shoot a Fuji XT-1 with their glass and also a Sony A7R with Sony glass as well as Canon TSE lenses.
For Blurb sized books all three cameras will deliver quality results. My guess is that if a book were produced with images from all three cameras it would be impossible to tell the difference.
I did a shoot Sunday with a group of models. I used the A7 with 24-70 for most, also 70-200. I also used the Fuji XT-1 with 50-140 and 56. The only way I can tell the difference, for sure, when looking at the images 1:1 in Lightroom is to look at the EXIF data.
If the OP, or anyone, wants smaller and lighter, then Fuji or Sony are good alternatives. Quality glass and nice cameras.
For most work I lean toward the Fuji. The Sony is primarily for architecture etc. with the TSE glass. I ended up getting the lens so I had something that auto focuses to take along. The Sony is also the first time in years that I've not had a second body. Probably wouldn't take it on a critical job without the Fuji kit in the car for protection, but I've also never had a camera crap out on me either.






