We sailed a 1260 for a week this summer (Sonder, Grenadines) and the
headroom in both forward cabins (including the master) was fine for both of us. Plenty of room to sit up comfortably while reading in
bed. Not enough to sit bolt upright, but I don't tend to do that from
bed... Didn't feel claustrophobic at all, especially with the
hatch and natural light just above your
head, and the
cabin itself being pretty huge. Absolutely love the design, we are actually eyeing an 1160 (same design and dimension master cabin).
I'm 6ft0 btw.