We installed a La Cornue range a few years ago on a project. It was a really, really well made appliance. That thing seemingly weighed more than a battleship. To the point of @Landomatic, they need to be the focal point of a kitchen, otherwise they may potentially detract from the aesthetics. In this case, we did a double glass-front SubZero fridge, and the range was flanked by stone columns in the center of the kitchen with a big island. Definite focal point and it made sense in the design.
From a functionality standpoint, this particular client was a major foodie and loved to cook, so it made sense to her. If you love to cook, can make it the show piece of the kitchen and have the coin, go for it. Otherwise, go with Wolf or Viking.
Sidebar... That same client gave me her 30 year old Viking range. Needed a new igniter for the oven, and I had to convert it from NG to propane, but it's freaking awesome. Though the new Viking stuff is fine, the pre-acquisition products are incredibly well built. The appliance guy I use came to do the conversion and said those old Viking ranges are some of the best built products he works with.