Nice pics comparing the two screens. You captured the two things I don't like about the pentile SAMOLED (although it is still quite useable):
1) The pixellation of solid reds. Reds and blues would in theory suffer equally from this but if you look at the zoomed-in pic the red subpixels are smaller than the blue ones so red has less 'coverage' and looks worse.
2) The 'phantom colours' around the text. You don't mention this specifically but look at the text of 'Gmail' underneath the icons on the two phones. Because of pentile there are 'stray' subpixels, especially noticeable in red and blue, around the edges of the letters. This is noticeable with black-on-white text as well.
Finally one practical change I would like about this phone is that the headphone jack has moved to the bottom. For me it always makes to put the phone upside down in my front pocket. That way when I grab it and hold it up it is right-side up in my hand. That doesn't work with headphones if the jack is on the top. The phone has to be put in right-side up and then taking it out and getting it right side up takes an awkward movement (with increased potential of dropping). Also when sitting say in front of a computer with the phone plugged in (for power or whatever) it makes the most sense to have the power/USB cable going from the top and the headphone cable coming out the bottom. I would almost spend $600 on this phone just for this alone LOL.