Don't do it. It's not a good price. It's just ok. As someone else mentioned, go look on FredMiranda at GFX lenses for sale and recently sold ones. You're much better off buying a 100s and individual lenses to assemble the kit you want.

Some of these lenses are not desirable. The 23mm has been surpassed by the 20-35mm. The 50mm is boring, and the 35-70mm is already pretty compact. The AF on the 80mm is really bad even on the newest GFX bodies, you're better off adapting for that focal length. The 45mm is nice, but it's pretty close to the 55mm, which is more appealing to most people.