Looks like you were in quite a bit of a hurry - the URL seems to imply that the test is of the 105/2 (but it's not so). 
Also, in the verdict, a competitor is named a "Canon EF 11-14mm f/4 USM".
Finally, a "1x BR element" is mentioned in the spec table.
Other than that, well... the Old Frog is looking like an interesting alternative for those who are not afraid of using fully "dumb" lenses (I know I'm not one of those). Their lenses even look nice on the outside (I know not all of the off-brand lenses are aesthetically pleasing).
Also, in the verdict, a competitor is named a "Canon EF 11-14mm f/4 USM".
Finally, a "1x BR element" is mentioned in the spec table.
Other than that, well... the Old Frog is looking like an interesting alternative for those who are not afraid of using fully "dumb" lenses (I know I'm not one of those). Their lenses even look nice on the outside (I know not all of the off-brand lenses are aesthetically pleasing).