catalina 34 Mark II or catalina 350
Any difference in feel is most likley to be caused by the fact that the 350 is carrying a 13'' beam. I have recently took possession of a new 350, but I can not speak for the handling of a 34. I can tell you the 350 is a bigger boat and in turn will handle differently, if for no other reason than the beam. As far as the layout, its great, roomy, easy to move around, it gives you that nontubular feeling, did I mention its great.
I have no complaints about its handling nor have I ever spoke with anyone who has had anything negative to say about its handling (I speak of people who have actually handled the boat as opposed to, let just say others). It is going to handle bigger than 34.