You had to know it was coming. After extending its well-regarded Retina display technology from the iPhone to the iPad, then the 15-inch MacBook Pro, Apple continued packing pixels on Tuesday by introducing the 13-inch MacBook Pro with Retina. Like its larger Pro predecessors, it also gets thinner and lighter this year, and like the MacBook Air, it sacrifices its optical drive in the process. Yet unlike that most waif of Apple notebooks, the Pro still uses a full-power CPU running at 2.5GHz — not the clocked-down chips found in the MacBook Air and its Ultrabook competitors. Its high resolution, low weight and full-speed processor make the MacBook Pro difficult to find a close competitor to in the PC world, but we picked Sony’s Vaio Z for its similar no-compromises approach. Read on to see how they stacked up, along with the old 13-inch MacBook Pro thrown in for good measure.