As @abruzzi points out, there are two versions of this lens, both offering the same 250mm image circle. The "SW" he mentions, aside from being single coated, takes a 67mm filter. The later EBC multi-coated "NSW" version, confusingly also marked SW, is larger and heavier (602 grams vs 425 grams, both measured on my uncalibrated kitchen scale with caps and retaining ring) and requires a 77mm filter. The NSW has a different optical design per Joe McGloin's website referenced by @abruzzi.
I never undertook to compare them when I briefly owned both. I kept the older version because its 67mm filter size matches what I use with my Mamiya 7 (with a step-up ring on the 65mm and 80mm lenses) and my LF lenses that don't take 52mm filters.
I certainly like the 105mm focal length for 4x5", but I use a Fujinon 105mm f5.6 instead. They made two of them -- very similar -- but compared to the f8 versions they are minuscule and seem weightless -- perfect for backpacking.
If large movements aren't a necessity, there is also the Fujinon CM-W 105mm ƒ5.6. Its a plasmat, not a Super Angulon type lens, so its a fair bit smaller than the SW lens, and it has a 170mm image circle which is enough for some small movements.
The CM-W is the one I have. The IC is 174mm so it's important to center the lens on the film. The other f5.6 is the NW. It's just as nice -- some say nicer -- but the IC is 162mm. In either case, if you are not focused on infinity -- and who does that? -- the IC is a little larger.
I just figured if a 90mm f/8 Super Angulon covered 4 x 5 with room for some movements, a 105 would too. It’s probably gonna be a 120 for me and I have a lead on one but can’t pull the trigger for just a little bit.
Depends on the 90mm & the 105mm. A 90mm might have a wide IC -- like the Fujinon SW (216mm) -- while a 105mm -- like the Fujinon NW -- might not (162mm).