I'd rather have an Edward Weston 4x5 contact print on my wall than any of my own enlargements.
A Weston 4x5 contact print would be valuable, because I don't know if any exist (other than perhaps proofs to see what's on a negative.) I was at the AIPAD show, where quite a few of Edward Weston's prints were for sale (some vintage, many printed by Cole) and none were smaller than 8x10. Here is an excerpt from a discussion of EW's technique:
"Weston's printing outfit was a contact frame lit by a bare light bulb in the darkroom. That's about as basic as you can get.
8x10 camera & negatives, contact prints, dry mounted that's it. (Even the Graflex shots, 3.25 x 4.25, were enlarged using the 8x10 so he could contact-print those.) (Contrast control in the enlargements must have been a bitch, but no doubt he worked out rules of thumb, and the Graflex was used primarily for portraits, where lighting could be largely controlled.)
By the way, for 8x10 prints Weston cut his dry-mount boards to 14 x 15.5 inches for horizontal prints and 13.5 x 16.25 for vertical ones. (Typically, that info comes from Adams.) Try them the proportions work well and look good."
The reason I raised the question earlier in the thread was that there was some discussion of the value of 4x5 negatives in terms of contact printing. I still feel that 4x5 is very small for a contact print (for display, as opposed to the proof prints most of us make to initially edit from our negatives, and for cataloging purposes) and I personally wouldn't suggest getting into large format with a 4x5 simply because you can make a contact print from that size negative.
I've also noticed that we seem to be a "polarized" population: every time a beginner asks for large format camera recommendations, there is one group who suggests press cameras, such as the Speed Graphics, and another group (me included) who suggest models allowing more movements. It comes down to whether one simply wants a larger negative (more pixels!) or whether one wants the perspective controls which view camera movements allow. Alternatively, some of the press cameras have built-in focal plane shutters, which simplifies their use with lenses such as the Aero Ektars which are wonderful portrait lenses (the AE, and other barrel lenses, do not have shutters and can be difficult, if not impossible, to mount in shutters). As many posts have suggested, it really comes down to your reasons for wanting to use a 4x5.