I doubt the mid week soccer games are negatively impacting your Ice and Mixed climbing strength plan progression much if at all. As for your friend making quicker progress; this could be due to his previous training history or some strength and leverage advantage. Does he/she have shorter legs? That’ll hugely impact the L-sit strength. There is just no way to account for differences like you mention here without knowing a lot more about you both. I’ve had folks who took 6 weeks of trying the L-sit almost daily before they could get their heels off the ground. Others who could hold a good L for 15 seconds on the 3rd try ever. We are all coming into this with different background, bodies and genetics. Don’t compare, just stick with it and you WILL improve.
Scott