I have three Zorki's, but this is where duplication ends in my RF camera set.
As Frank said it above, would you add a second woman to your life? Maybe this is an incomplete question .... ? If it had been: "If you are totally happy with whom you have, would you add another woman to your life, knowing that you will lose the current woman ? This concept applies to the situation when you must sell yourt first RF cmera to get another one. With a Zorki-4, this concept does not apply unless you are on a $30 budget for cameras.
I use my Leica M3, M6, IIIc, Standard and CL on a "fair" rotational basis. Each girl gets a shot at old me. I am a happy dude!
Raid