Of course there not all the same, thats what makes more rare of a grail cop. Everybody interested I'm sure has there preferred season of which leather or color they like the most.
Ill have to agree with @Fycus that the trade of a 5-zip for a leather shirt was dumb. I could only see buying a leather shirt like that if it had high percentage mark down or if you have the money and already own a leather jacket. It dosent seem that nice, or something that can be worn enough to justify a high price.