Fizik 43 is narrower for me compared to Shimano 44. Tried both. Giro Trans in 44 was narrower than Shimano (also tried). Shimano 44 is roughly the same width as a Specialized Expert (Carbon Sole) 43.
If you have wide feet, I would highly recommend the wide width Shimano. Mavic Zyxelium (sp?) in a 9.5 is equivalent in length to a Specialized Expert 43 but is narrower.

I have not yet tried Lake or Northwave.

Specialized really ticked me off because they went to a narrower last with the latest generation S-works and Pro (tried both). No idea why.