I'll add my ramble to this.
Good leather is more breathable than any membrane found in fabric boots. Therefore there is, IMHO, no point in buying leather boots with a membrane. Leather boots are 99% waterproof - ie you'll get wet after *hours*, and hours and hours of monsoon, so there seems no point in buying fabric boots. Which, with a membrane, they breathe less than leather, without one, most are sponges.
none of the above is true except the bits that are. ;-)