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I've been shooting a lot of 1:1 format these days, and, needless to say, it's frustrating that the RX1 only offers two viewing aspect ratios. I usually just use black electrical tape on top of my LCD protector, in order to mask off whichever aspect ratio I'm going for, but the OVF is a little more tricky.
Well, I realized recently that Voigtlander made a Kontur viewfinder in 6x6 for an 75-80mm'ish lens, and, as luck would have it, cropping the RX1 square gives me about that equivalent.
I just received the OVF, and it is awesome. Kontur OVFs are probably the best out there, because they have 1X magnification, and you use both eyes with it. Essentially, it's a black box with frame lines that projects the frame lines into your normal vision, so it is huge and bright. I'm talking nearly the same size as my Hasselblad's 45 degree finder, and brighter.
I had to cut a few millimeters off of the front of the hotshoe, since the Sony smart shoe doesn't let it seat all the way in, and the rear of the shoe still sticks out a bit, but I've locked it in there solid, so no worries. My Kontur was pretty scuffed up, so I added my Hasselblad camera leather to it, too. I can still get my neoprene case around it, and, although it looks a bit bulky, I really don't notice much difference in size. I think it's worth it, considering it is probably just about the best OVF possible.