I visited PKX this past January, and it was an enormous upgrade to PEK along all dimensions, including: Terminal architecture; sense of place; amenities and restaurants; and especially with regards to transport into the city. PKX is on the southwest side of the city, on the opposite side of town from PEK, in a relatively undeveloped area, whereas the PEK - downtown corridor is one of the most congested urban areas in the world. It took me 20 minutes to ride to PKX from downtown in an empty bus, whereas PEK to the city took 90+ hellish minutes in a bus 100% full with coughing people, and luggage blocking the aisles (note my HU flight arrived into PEK Terminal 1, and there was no train to PKX yet at the time, so bus was the only way to connect). People actually post selfies from PKX, because the common areas are so cool-looking. I'll choose PKX over PEK whenever possible from now on.