A quick comparison on some of the obvious look alikes. I think the Tom Ford Eyeshadow Blend brush looks like the MAC 217 (Blending Brush) or Hakuhodo J5523. Upon first use, I actually found the Tom Ford Eyeshadow Blend brush to be way more precise than the MAC 217, and maybe a little less "blend-y" than I had hoped. Fortunately, after cleaning and washing it, it fluffed up a little and is now both precise and "blend-y" as hoped :). I think both the Hakuhodo and Tom Ford brushes are similar (I've heard that Hakuhodo actually manufactures the Tom Ford brushes) and softer than my MAC 217 brushes.
To note, I took pictures with both of my MAC 217 brushes (newer/1 month and older/4-5 yrs) because the newer one seems to be fluffier than the older one, and I'm not sure if that's because it's new or if they actually modified the shape some in the last few years. Anyway, I find the MAC 217 brushes very functional, but I do find them a bit scratchy or wiry (both new and old) at times when blending. The Hakuhodo and Tom Ford and always soft and a pleasure to use.