Re: Swarovski ??
The link posted above is a good read.
The differance is largely weight. The El's are lighter. They are also brighter. If you want the absolute best and have the cash, the choice is simple. If cash is a concern, the SLC's are still a he?? of a pair of bino's. The SLC's arent much better than (if any) the classics you already have. Objective for objective. The EL's though would be an upgrade.
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.