Comparing the new 15-inch models, the 2.6GHz laptop is 8 percent faster than the 2.3GHz version. As we saw in the 13-inch laptop results, the high-end 15-inch model benefits from having more memory than the low-end model, as shown in our Photoshop results.

When you throw the Retina MacBook Pros in the mix, you'll notice that the fancy new laptops with the Retina screens benefit greatly from having flash storage instead of hard drives. Overall, the 2.6GHz Core i7 Retina MacBook Pro is 38 percent faster than the new 15-inch regular 2.6GHz Core i7 MacBook Pro. The 2.3GHz Core i7 Retina MacBook Pro is 30 percent faster than the new 15-inch regular 2.3GHz Core i7 MacBook Pro. In disk-based tests, such as our Duplicate 2GB folder test, our Zip 4GB folder test, and our Unzip 4GB file test, the Retina MacBook Pros fly by the regualr laptops.

One test where the regular laptops have an advantage over the Retina laptops is with the Portal 2 frame rate test, even though they have the same graphics cards. (The Retina laptops and the regular MacBook Pros have the same graphics hardware, but the regular 2.3 GHz MacBook Pro's GeForce GT 650M has 512MB of memory, versus 1GB in the other three laptops). The low-end 2.3GHz regular MacBook Pro was 14 percent faster than the 2.3GHz Retina MacBook Pro. The high-end 2.6GHz regular MacBook Pro was 8 percent faster than its Retina counterpart.

Check back soon for Macworld's full reviews of the 20120 13- and 15-inch MacBook Pro models. And as always, comments and test suggestions are always welcomed in our comments section.