Jaeger-LeCoultre

Clavi
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6.31mm thick for the 38mm hand wound ? that is maybe thin but not ultrathin

Actually, I was quite surprised when reading that the new 38mm "ultrathin" is 6.31mm thick.
That a very significant increase in thickness, from the previous 4.20mm

I would have imagined that JLC would have increased slightly the thickness of the watch, in proportions to the increase of diametre. That would have given a thickness of 4.69mm.
But 6.31 that is quite a lot of additional thickness, and I wonder why they did need to increase thickness so much.

The classic Ultrathin had a thickness ratio of 12%  (Thickness / Diameter). That was the proportions which somehow defined the standard for ultrathin.
The other classic JLC ultrathin, the pocket version, had a similar ratio (I have a very old ultrathin ("couteau") JLC pocketwatch which, at 45.0mm for 5.0mm thickness is at 11%, so comparable, but even more remarkable as the movement is very large at 38mm, not 21mm!) 

Now, the new watch has a thickness ratio of 16.6%, so it is proportionally 38% thicker than the classic Ultrathin. This is such a difference that I don't consider it ultrathin anymore.

The new watch is definitively good looking, relatively thin watch, there is no doubt about it, and its proportions might work very well altogether, but IMHO, it is not an ultrathin anymore.
It is now more a "hand wound master classic" than an ultrathin .

(now, that is what I call ultrathin.....)