I missed out on seeing the QM2 last week, but I did see the P&O cruise ship Oriana at Portside Wharf Hamilton yesterday, shortly before it departed. It's also a big ship, but it can't be that big as it apparently fitted under the Gateway Bridges. You can read about Oriana at Wikipedia.
This shot was taken looking downstream away from the sunset.
I experimented with processing the image in both Aperture and Photoshop, as you do. The colours somehow came out better with Aperture, but the sharpness came out better with PS (as usual). I went with the sharpness.