Bob,
Our original C-22 was also a 1980 vintage,(#9405). What GREAT times we had with her for years as our girls were growing up. Having lived on her for about 6 months during the week while I was on a project in St. Louis years ago, and spending many weekends on her with the girls, including a week long cruise up the Mississippi River, gives me a pretty good insight on which version of the C-22 is my favorite. Now a bit of a confession. Yes, we also have a "new design" that we recently picked up. She is a swing keel version, and the previous owner didn't maintain the keel properly, and the boat was kept in a slip out here on the coast, so the salt water has done a number on the keel. She's my retirement project boat, and I intend to install a new style swing keel from Catalina. This will hopefully eliminate a lot of the keel maintenance issues, plus that fact that she won't be slipped, at least not for any extended times. But, we've not sailed her yet, but I do like the "new design" interior much better that our original C-22. The cabin design with the re-designed forward section is a HUGE improvement with the hatch right above your head while in the V-berth. I also believe the starboard quarter berth is a bit wider, and without that horrible sliding galley, gives you a lot of room to stretch out.
OK, getting to your question....as a "cruiser", our wing keeled MK-II is simply AWESOME! Extremely stable. But we've got her set up for just my wife and I and our little dog. The V-berth on our boat has been converted to a semi-enclosed head and luggage storage. The MK-II interior has nice long quarter berths port and starboard in the cabin, and that's where we sleep. The cabin also has a small table which hide's the swing keel trunk on the swing keel version, but the newer,(post 1996), wing keel version uses the base of the table as a small storage locker. We use it for our "spirit's locker". I ran an experiment for several months and removed this small table and liked how it really opened up the cabin floor. But, my wife didn't like it, and there was no place to hold your morning coffee, so as the Admiral ordered, the table was re-installed. Now again, our interior has been modified from a stock MK-II interior. The padded back rests for the quarter berths have been removed and a varnished teak board was installed giving us several extra inches of "hip room" when sleeping on the quarter berths. We recently had new interior cushions made for the quarter berths. So we have a better quality 3" foam than the stock cushions had, and 3" of memory foam toppers that we unroll for sleeping. The bunks are EXTREMELY comfortable! HUGE improvement in sleeping comfort over the stock factory cushions. The wing keel is ZERO maintenance. And although the ocean floors aren't covered with lost C-22 swing keels, and the vast majority of C-22's have swing keels,(including our other C-22), when we get out in the ocean and the wind pipes up and the waves build, it's just reassuring knowing there are 6- 1/2" stainless steel bolts holding the keel to the bottom. Catalina really improved the hull to deck joint on the MK-II's, which has eliminated any potential for a leak to develop at this joint like the original and "new design" boats can. My only complaint with the MK-II is I wish Catalina Yachts would've retained the pop-top design from the two original versions. The MK-II is simply hinged forward and swings up. So the headroom varies, unlike the other versions. I know it was cheaper to build them this way. Also, when the pop-top covers are installed on the other boats, you gain some nice storage area at night on the cabin top. The MK-II's also have no exterior wood, so as I've said in the past, they tend to have the personality of a Clorox bottle, but when the day is over, I rinse the boat down and walk away. No sanding, no varnishing, maybe some occasional metal polish, but the MK-II's require much less maintenance. BUT! a cleaned up, decked out "new design" C-22 is the prettiest girl in the marina!
Those are my opinions......but I believe Catalina really hit the nail square on the head with the MK-II's for us cruisers.
Don