While the Shard might be the most dramatic recent change to London's skyline, it is by no means the only one. Comparing these two photos taken from St. Paul's shows just how much the skyline in the City of London has changed in just 5 years.
The buildings under construction are the Leadenhall Building and 20 Fenchurch (aka the Walkie-Talkie). Completed new buildings include the Walbrook Building and Broadgate Tower.
You can see each photo below:
Found via reddit.