The iPhone 7 Plus still takes better horizontal panoramas than the Samsung Galaxy S7. There are almost zero artifacts and tears at the seams, even with moving and complex subjects. They sometimes appear, but rarely, while ghosting and tears appear easily in the S7’s horizontal panoramas.
The iPhone 7 Plus, however, takes all that wonderful performance and then proceeds to throw image quality away. When you look closely at the panoramas, there should be more image detail and wider tonality than there is. Looking at the file info, it looks like the 7 Plus is heavily compressing JPEGs to minimize file size, which might explain the loss in image quality. A 9,068 x 3,864 panorama JPEG from the 7 Plus weighs in at ‘only’ 12.5MB, while an 8,544 x 3,888 panorama JPEG from the S7 clocks in at a large 47.4MB.
Again, it seems that Apple is adapting its cameras’ features to suit most people, with an acceptable medium file size but lower quality, while Samsung has a large file but higher quality. Still, it strikes me that too much appears to be lost with Apple’s aggressive compression, and they can afford to loosen up a bit and go for a bigger file with more quality.
Oh, and all this applies only to the 7 Plus and the S7’s horizontal panoramas. Both their vertical panoramas are awful, with ghosting and tearing aplenty.