OK, I looked closely at these 3 last night. Keep in mind all of these should be great performers - we're splitting hairs here to some degree.
Using both visual cues and doing the best I could with a digital calipers, the Yuki was thinnest at the edge, followed by the Shimo, then the Fujiwara. They're all thin at the edge, but the Yuki Bunka was one of the thinnest knives at the edge I've ever held in my hands - I haven't seen an Adam Marr knife yet, though
The Yuki and Shimo are thicker at the spine in the back 1/3rd of the blade, but they are thinner at the very tip, due to the Bunka geometry vs. Santoku. The Fujiwara is a taller blade and has some extra length over the Bunkas. My 2 Bunka examples were almost identical in profile/geometry/weight/size, etc. They were 4.2 oz and are lighter than the Fujiwara.
The Fujiwara has a longer blade road and smoother convexing than the Yuki (but it's taller also). It's fit and finish were not quite up so the Masakages IMO - not bad, just not quite the same. My 1st impression OOTB was that I thought it would have been better. The neck/choil area needs some finish sanding to smooth out the edges. The cladding is a true San-Mai and the spine could use some smoothing also IMO. This knife actually shows the clad construction at the spine better than any knife I've seen yet - pretty cool.
All 3 were screaming sharp OOTB.
Honestly between the 3 Masakage Bunkas I'd probably pick the Yuki #1, Shimo #2, Koishi #3, unless the AS steel in the Koishi is a major factor for you. Koishi is a little thicker than the other two Bunkas. Shimo is a fully reactive blade, otherwise I would tie it w/Yuki for #1.
Between the Fujiwara and the Bunkas, the Masakages just feel like light food scalpels, but I would have concerns if your prep/line environment abounds with stainless steel, plates, and other hard objects that you could ding the tip on. The Fujiwara feels like it might be more durable, especially because of the Santoku shape. If you go with the 195 Gyuto, then you also have a tip to worry about, but you get more length.
If you can care for the more delicate nature of the Bunka shape and deal with a little less length, I think the Bunkas would blow your mind as a smaller/delicate prep tool. They're different, more nimble, with a finer tip than the Fujiwara Santoku. The Fujiwara should be a great performer in it's own right, though
Hope this helps - Steve