Thanks guys for your feedback.
The background would have been better with greater seperation, I agree. I was shooting at f8 on the siggy 10-20 so to throw the b/g out of focus is going to be a tall order with this lens even at maximum aperture.
Not so sure about the focus on the b/g rather than the bike, AF was used but the focus point was selected for the fuel tank area of the bike. It does look a bit soft here maybe due to save for web options??
Here is a colour version of the first, same crop etc, except this has not had any local brush adjustments done as was the case in the B&W version. (exposure adjustment to selected parts of the bike and a clarity reduction on the b/g!)