Microsoft marketed the Surface Pro 2 as the tablet that's got it all, but apparently that wasn't quite true, given the big leap forward the Windows maker has made with the announcement of the Surface Pro 3.Although everyone anticipated Microsoft would unveil a smaller Surface (and the event invitations seemingly confirmed such a device), the folks in Redmond went in the other direction, bypassing a new model of its ARM-based Surface tablet in favor of a larger Surface Pro instead.Available for pre-order starting Wednesday, May 21, the Surface Pro 3 certainly looks like it lives up to Microsoft claims that it's the tablet that can replace your laptop, but is it marketing hype or truly a significant upgrade to the Surface Pro 2?ScreenThe Surface Pro 3 is certainly larger than its predecessor, with a 12-inch diagonal ClearType Full HD screen that abandons the previous 16:9 aspect ratio of earlier models for a unique 3:2 aspect ratio. That makes for a nice 38% increase in screen estate compared to the Surface Pro 2's 10.6-inch display.But it's not just about the size of the screen: Surface Pro 3 also packs in 2160 x 1440 pixels compared to the Pro 2's 1920 x 1080 (a 50% increase) for what Microsoft calls a pixel-free display with the highest contrast ratio in the industry. Windows 8.1 also includes optimized scaling specific to the Surface Pro 3.