Rows 4 & 5 are in the second section (the mini-cabin behind C and to the left of the door used for boarding).
If you're in Row 5 you're first off the plane...
Didn't see any visible differences in pitch and didn't check out the exit rows.
Personally, I'd go with an aisle seat in row 5.
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More Room Throughout Coach: the Website of Free Miles and Free Markets