I am going to disagree with Silver02ex on this one. My opinion is the Air France A380 is not at fault because: a) He was taxiing via the clearance that was issued by ATC. b

he was on the yellow centerline of the taxiway. c

notice the flashing amber stop bar from the SMGCS low vis lighting. That flashing bar indicates a Taxi Holding Position for OUTBOUND taxi clearance during low vis to allow adequate clearance from the movement area. (the Comair flight was not clear of that zone). d

Taxi speed of the A380 was not excessive. I have taxied at up to 25 knots on straight taxiways then brake to slow down to 10 kts. or so and then let the speed build back up. That prevents hot brakes.
Another factor to consider is the height of the cockpit above the ground. On the 747-400, the pilots eye height is 38 ft. above the ground. At that height, you cannot accurately judge taxi speed, and you cannot see the wingtips from the cockpit. The guidance I have been given from my company Flight Operations Manual is that if you are on the yellow centerline, you are assured adequate clearance from obstacles. (No consideration given for aircraft within your safety zone.)
If it looked really close, I would have stopped the A380. I really think the Comair flight was too close, but I also understand there was considerable congestion inside the horseshoe and that's why the Comair stopped where he did.
The Air France crew was probably running through Taxi checks and might have been task saturated at the time. It was also night time and it might be difficult to judge exact aircraft position (especially when you cannot see your own wingtip.)
Again, this is just my opinion with no disrespect intended to Silver02ex.
Fly safe,
757 Guy
MSP Based Delta Pilot