Apple states that the 13" MBP is 12.78" x 8.94" x 0.95".
Pelican states that the 1080CC's internal dimensions are 12.80" x 9.80" x 1.70" and that it will fit a notebook that is 12.3" x 9.3" x 1.5".
Here's a
Dell XPS M1330 inside of a 1080CC. According to the M1330's
official manual, its dimensions are 11.26" x 7.03" (it also has a 13.3" screen), but according to a
CNET review it's 12.5" x 9.4". As you can see it goes right to the edges of the case. CNET's measurements (also corroborated by
NotebookReview.com) seem more likely considering its flush fit with the 1080CC and the 1080CC's stated notebook-fit dimensions (it actually even goes 0.1" (2.5mm) over). But to throw it for a loop,
DailyDigitals.com stated it's 14.06" x 10.34", and
Shopping.com put it at 12.52" x 9.37".
Short of physical confirmation, it looks like a 13" MBP will fit into the 1080/CC, but barely (may even press against the ends of the case). A 1090/CC, on the other hand, will fit it, with a bit of extra cushion room to spare.
If you're dead-set on the 1080CC, I recommend buying it somewhere where you can return it if it doesn't fit the 13" MBP to your liking, at which point you can switch to a 1090CC.
By the way, I share your frustration. It's a beautiful case, and I would love to have it as well being that I'm planning on purchasing a 13" MBP soon - I've had a great experience with the 1490CC for my ThinkPad. Best of luck with your decision, and please post your results if you decide to take the plunge.
EDIT: The M1330 is
rounded at its back end and I believe the discrepancy in DailyDigitals.com's measurements is due to them using a tape measure that rolled over the rounded edge. I'm going to trust the 12.5" x 9.4" measurement on it. My guess is that you'll have to jam the 13" MBP to fit into the 1080CC sideways and it likely won't fit.