The sound varies too, but generally they aren't as midrangey as many other archtop guitars; the trebles are often excellent, the bass is good. I would say, a mix between a flat top and an archtop, like the Rogers, but different. Of course, you have to try it yourself....They are clear-voiced and have a very good tone separation - and are acoustically loud as hell. No wonder, though 17 inches wide, they are really light-weight guitars and great electrics with a flat silver-/gold-foil deArmond. However, never found a Kay guitar made after 1958 that I liked. I guess it has to do with Henry Kay Kuhrmeyer's company sale to Sidney Katz, a former manager of the other big Chicago guitar company of the time, Harmony.
Btw., on the left in the background you can catch a glimpse at one of my steel sculptures I made years ago by using a plasma welder. It's 6mm sheet steel, a tribute to the German painter and sculptor Horst Antes, entitled "Slipping away to the forefathers". I made also some sculptures out of 10cm steel - and I wish immodestly I could make as big ones like say Alf Lechner (http://www.lechner-museum.de/). The incredible resistance of steel is tempting to me ... but it's much easier to work on wood.
thanks for sharing sight on your walls. As a kid, I always had friends, who had better toys, and I loved to go for visit them 
You remind me this feeling, what a pity, you not live in my neighbourhood 
