Thanks to a first-class execution, the HP Spectre x360 13 is the Mini-Me of its head-turning 15-inch sister. What’s most surprising about it is how little HP had to drop from the design to shrink it into a 2.8-pound (1,286g), slightly larger than letter/A4 sized 2-in-1 laptop, turning the x360 13 into the most compelling 4K convertible in its size class. True, the only other real competitor in that class at the moment is the Lenovo Yoga 910, but it has clear advantages over that and only a few relative drawbacks.

Of course, the first question you have to ask yourself when considering either system would be “do I really want such a small 4K display?” A lot of people don’t notice or just don’t mind the difference between the roughly 200 pixels-per-inch sharpness of 1,920×1,080 with the 13.3-inch display and the 331 PPI of 4K UHD. I do. Interface text is easier to read, and I can really judge photo sharpness. But it comes with two big tradeoffs: battery life and price.
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https://www.cnet.com/reviews/hp-spectre-x360-13-inch-2017-review/