well here's a work done by me and larven which i finished earlier, canary wharf in just a few years time. see if you can tell which bits are real and which bits are fake :) ill post the original in a couple of days so you can see the difference.
http://www.skyscrapernews.com/canary_wharf2008.jpg

Everything blends so well. What is fake? I can't tell. Very nice photo, gothic! Love it. Great skyline Canary Wharf will have in 2008! :)

Only the foreground looks real. The background looks all fake. Too shiny. But it doesnt matter cause it looks kick arse anyways!

Love it :) 10/10

looks great but the rendered buildings look to fake so 8/10, great work though, it doesn't look right wiv the lights on in real buildings then the rendered ones not having lights

while like some stupid nut mentioned, the entire background looks fake, but it looks great anyways!

9/10