The need to tap to focus on the Mavik rather than AF as in the P4 Pro and the P4 Pro features a full one inch CMOS sensor with 20-megapixels in RAW, and can shoot video at up to 4K 4096 x 2160 in 24/25/30p at 100Mbps.
The Mavic has a narrower field of view, and it also has weaker low-light...