When the X113 arrives in Australia, it will be about $2700, according to my local pusher, er, camera dealer. The Sony RX1 is now selling for about $2500, so if I had to make a choice, I'd be rather torn between what I know would be the excellent handling and ergonomics of the 113 vs the full frame capabilities of the RX1.
The X113 is practically Leica's answer to the Fuji X100, albeit minus an internal viewfinder of any kind. As I already have a X100, which I'm guessing uses the same Sony 16mp sensor as the 113, I'm wondering whether the differences in handling, the bit of extra speed, and differences in lens rendering would be worth it. Hmm...
It is an interesting three-way decision point.
I disregard the question of price differences since, indeed, you already have the X100 and the capabilities of all three cameras are so close that if price were a real discriminator you would rationally immediately ignore purchasing anything else in this camera type. (Same thing held for me as I already had the Leica X2 ... Why was I interested in the X when the X2 is already very similar to the same thing? Certainly not because of the cost of acquisition or some huge difference in capabilities...
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Between the X and the RX1 is a matter of which camera's ergonomics suits you best and which lens' rendering you like more, IMO. The fact that one is full frame and the other is APS-C is not too big a deal since these are fixed lens cameras. Yes, the DoF curve will be a bit different—with the RX1 @6' focus distance and f/2, you'll net about 1.1' depth of field vs with the X @6' focus distance and f/2, you'll net about 1.9' depth of field—and I expect the RX1's larger sensor will deliver another stop or so of sensitivity, but in the grand scheme these are relatively small differences, to me anyway. The RX1 has more features than the X, and the X body is larger and simpler to use; these differences mean that the X is easier to manage comfortably for what I wanted a camera of this type for.
The Fuji X100 sensor may be the same base family design, but it's quite different in use and especially during raw processing due to the differences in the color filter matrix. I'm on record as simply not being much of a fan of the Fuji sensors from an image processing standpoint, regardless of differences in ergonomics and menu design. The built-in optical viewfinder+EVF of the Fuji is a plus, but like the difference in format between Sony and Leica above it seems not that huge an issue to me: I simply fit the viewfinder of my choice (either EVF or OVF) and forget about it.
So ... Handle them both, test them both by taking a few snaps with them at the store and taking those home to play with in your favorite image processing software, and then buy whichever one pleases you most, if you buy either at all. It's all good.
Ach, there I go nattering on about equipment again. It's a habit. Back to photos...
G
Leica X :: ISO 100 @ f/1.7 @ 1/400 second