Since I had asked for it in the past myself, here are some comparison pics between the Apple leather case and the ESR leather case.
I have to say, yes you pay a premium with Apple, it is almost triple the price, but it is almost triple the quality... Both the leather material and the fit are much more superior.
The ESR cover has a much more grainy leather and is also "paperlike" as others have put it... Meaning it seems like paper-thin and is also quite "slippery", like paper. Also The side lids are more raised above the screen, to the point where it might even be disturbing while swiping up.
Both of these points were of no concern to me, when I was using the ESR, so for the money it is still a great choice... But now using them side by side, there is just no comparison...