No problem, I'm still very enthusiastic about this lens.
I know having IS on a prime in this focal length causes heated discussions, but for me IS is a lot more useful than f/1.4.
The day I got it I was walking along the Southbank market on the way home from work. It was a Christians market so full of lights. I noticed that towards the edge the lights seem to be more elongated. Stopping down cured this but I was convinced it was a faulty lens as I really hadn't read about this before.
When the second lens arrived from Amazon (and I had already asked to return the first) it was identical. After a bit of searching I found out that this is normal for this, and a few other primes. I learnt to live with it and really didn't notice it after that. You know what's it's like with a new lens, you view everything at 100% for a few days lol.
For what it's worth both copies were identical to my eyes, even at the edges, and each needed no more than +/-2 MFA, which is practically nothing.
Damn, this is getting me closer to getting another.