I can attest that the X has terrible Wi-Fi. In my apartment bed, my HTC M9 can stream 720p YouTube while my Xperia X can only stream 360p. In a large house, my M9 will hold a signal in all corners of the house while the X will drop the Wi-Fi connection completely in far corners. When walking around my college campus, the X cannot hold a signal while the M9 can. In the exact same spot on the exact same table, my M9 will always get twice the speeds in a fast.com speed test. This occurs on all firmwares (Marshmallow and Nougat, stock and Concept).
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