The Shallot is a great design. It gives you a good length of blade and still rides pretty unobtrusively in pocket. If you have a Blur, that is very close in size to the Shallot. Same blade length, and same overall length. The Shallot is just a small fraction of an inch longer when closed due to the handle shape at the pivot end.
Thickness-wise, the Shallot is the thinnest of that lot. Eyeballing it against a 1/32nd ruler (I don't have calipers), it looks to be 11/32 (0.34") thick. Delica looks around 12/32 (0.38"), and Blur & PM2 are about 14/32 (0.44"). 0350 and 0550 are about 16/32 (0.5") and 18/32 (0.56") respectively.
The thin and narrow body of the Shallot are really nice. The Delica and Endura are also fairly thin, but due to the thumb hole, they are a bit wider. I'd say a closer comparison would be something like a Benchmade 940, which is also pretty thin and narrow, yet sports a fairly long blade.