I would say that the top end on the SL4 is faster and if you are looking for a steady locked in feel the SL2 is what you are after. The SL 2 you can push and push on the back foot where the SL 4 you need to be lighter on the back foot and keep a eye on pushing too hard.
I have been using the SL 4 with the 122 and 94. I am quite happy with this.
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