Sorry, I'm not really a Becker owner, but I'm slightly obsessed with sheaths.
I really don't like leather as it takes 4 years to dry and I hate damp stuff and so do my knives. I quite like Kydex, but find the area needed around the knife to keep it clamped together and secure a bit over the top. On some of my knives it almost triples the width they take up which isn't cool. Apart from that it's awesome.
I had a sheath made by a boot maker out of Lorica, a magical leather like material which is waterproof. On the inside I have a further waterproof backing to be doubly sure if it somehow got water in the dampness wouldn't be in contact with the knife. Very pleased with it so far. I had a pair of motorcycle boots made from the same stuff and was so impressed with how waterproof and long lasting they were I thought it'd work perfect for a sheath. It doesn't absorb any water. I don't know why knife makers don't use it, it has the traditional leather look but it's way better.
Leather sheaths put me off knives because I know I'll have to put a ton of effort into finding a replacement and I'm paying for something I'll probably never use.