Why is the Lumia 920 heavy and thick?

from this Verge comparison:

Lumia 920

  • Thickness: .42 inches
  • Weight: .41 pounds
  • Capacity: 2000 mAh

RAZR Maxx HD

  • Thickness: .37 inches
  • Weight: .35 pounds
  • Capacity: >2530 mAh (use time: 32 hours)

Galaxy S III

  • Thickness: 0.34 inches
  • Weight: 0.29 pounds
  • Capacity: 2100 mAh

i mean, it's really heavy, or thick, on its own accord. But in comparison to the very similarly specked competition it seems a little excessive.