The Rock looks like The Pebble next to Sun Ming Ming.
Adam Rifkin stashed this in Size matters.
Imgur comments: http://imgur.com/ZyLQfq2
Sun Mingming is 7 ft, 9 in (2.36 M), 370 pounds.
Here is Sun Ming Ming with The Mountain:
Source is Facebook.
The Rock meeting Sun Ming Ming gif:
The Rock is 6 foot 5, 259 pounds. Woah.