Hi @Alec Leamas
I have both the 11.5 and 13.7, and the difference is substantial. I've had the 13.7 for a few months and never "got it" with them. I couldn't find the cuff or the drape was weird to me. I think it's like @Signet says. They take time to settle. This is not the case with the 11.5 super smooth.
The 11.5 arrived and showed me what the drape could become like on the stiffer 13.7s. The 11.5 started like they had been broken in. They feel like I'm wearing heavy linen. The hand is wild and so bumpy - but the bump is subtle enough that it is smooth. It feels coated with ultra fine, mildly crunchy polar fleece. It's really cool, light and probably as light as you can get.
Because of the 11.5 I was able to figure out where to cuff the heavier pair, and now these 0105 are my favorite cut at the moment. Unbelievable comfort. The super smooth are almost too comfortable. I've handled a lot of fine denims and I think maybe they remind a little of Momotaro 14 Oz but the Momotaro do not stretch. Raleigh Denim, maybe something similar but the Full Count super smooth is not as tightly woven. It's not a terrible amount of stretch. It does happen in one wear, within the first two steps, and then it seems to plateau.
Couple of snaps. Both have been washed twice now. I wanted to get some room out of the super smooth. Even though I sized down to the 29 in the super smooth, they feel looser than the 13.7. I measured them and the 29, after a couple of hot washes measures 30" and the waist 30 in 13.7 measure 31". The super smooth denim gives quite a bit though. I probably could have gone with a 28.
The blue on the 11.5 is really deep and smokey. It's not gray smoke, but smoky navy blue. It appears to be deeply saturated. The 13.7 don't have the same depth to the dye, that's the only way I can explain it. From the surface, I can see far more white threads in the 13.7.
(Left side is 11.5) (Right side is 13.7)
(Left side is 11.5) (Right -top is 13.7)
My two cents, get both pair if you can. Start with the 11.5 since it seems newer and maybe not as available soon. Awesome summer weight.