I was looking closely at my GW 27752 last night. I am still amazed by the accuracy of these repros. I have a number of old horsehide jackets including 2 original A-2s and do think the leather that JC uses is spot on.
Like originals, the tanning techniques used go right through the leather. If you look closely at the new ELC RW you will see the lighter base of the leather on the underside. This does not appear on the 1930s and 1940s horsehide examples I have and would suggest a different tanning technique. I also have a Buzz Rickson Aero and the tanning also goes right through the surface to the underside.
Given the cost of ELC, and some of the (still) outstanding accuracy issues, I believe Goodwear is the leader at the moment. The only thing stopping me from pulling the trigger on one directly from Goodwear is the fear of getting stung by Customs Duties and Taxes. This would push the cost right up. I may be going to NY later in the year and if so I will see if I can coordinate this visit with having a jacket delivered there for my collection.