The only vehicle that comes close to the GT in luxury/comfort is the LWB F01 7 series, and that car can't match the outright flexibility/utility of the GT. Case in point, with the seats folded I was able to put my BMW Cruise Bike (yeah I know I need a 1 800 # ) in my GT without removing the front wheel and/or scratching or soiling a thing.
Please don't anyone say that the Audi A7 is a competitior to the GT. The exterior of the A7 is not bad, but It can't touch the interior of the GT. I couldn't fit comfortably in the back without hitting my head due to the sloping C pillar design. The handwriting pad is a nice touch but I wasn't blown away by the ergonomics or the materials used - even on the top line prestige model. A young salesman tried to tell me the A7 shares the same platform as the Panamera I told him he better do a little bit more research - internal and external - before he tells any more customers that info. I think I hurt his feelings..he ran off.
Again at present the GT stands alone in its class for the sheer value of acutally shairing the chassis/platform/luxury of BMW's flagship - Just my two cents