Vivek, great shots over at the Street thread, including the three shots above the following,
http://www.getdpi.com/forum/sony/34977-street-images-9.html#post493086
Here is the Nikon 20mm 2.8 als via Canon SB on 5n,
note my comment at the bottom of this post, that Metabones does not recommend using this lens!
And the Contax CY 28-85 at 28mm and 85 with some architecture circa 1900 on a dull day,
Now I see that the Nikon 20mm 2.8 als is on the metabones list for not fitting on the Canon EF Speedbooster!
The protusion appears to be pushing down the Canon ef contact pins, making it harder to turn the lens when mounting, so perhaps not recommended, and certainly not recommended by Metabones, as you can see on the following link or below,
http://www.metabones.com/sony/ef-e-speed-booster
"Many manual focus lenses have rear protrusions (spikes, levers, other appendages) which would damage the optics and/or housing of Speed Booster™. They need to be modified before they can be safely used on Speed Booster™. Check and make sure there are no rear protrusions from the adapter/lens combination before using on Speed Booster. Scratches and damages caused by rear protrusions or by poor quality adapters are not covered by warranty. The following is an incomplete list of lenses known to be incompatible.
Leica R
Super-Elmar-R 15mm
Elmarit R 28/2.8
Elmarit R 35/2.8
Summicron R 50/2
Nikon F
20/2.8 AI-S
Olympus OM
OM 18/3.5
OM 21/2
OM 21/3.5
OM 28/2.8
OM 50/1.8
Pentax K
Every Pentax K-mount lens has a protruding fin and an aperture lever. It does NOT fit."