I've been shooting lacrosse and indoor basketball (girls 5th-7th grade) for a while but just started shooting high school night football, field hockey, soccer games. I currently have Canon 500mm f/4, 100-400mm f/4-5.6, 70-200mm f/2.8, and Sigma 85mm f/1.4. I didn't dare use the 100-400mm for poorly lit high school fields, the 500mm is too limiting other than standing in the corner of the end zone, and the 70-200 doesn't get me close enough. Considering the Sigma 120-300mm S, which appears could replace the 100-400, although the 100-400 is easy to hand hold during day games. Considering the pluses/minuses of selling both the 70-200 and the 100-400 to buy the Sigma 120-300. I'd hate to lose the 70-200 though.....Any thoughts? BTW, I shoot with a Canon 1DX full frame and do have a 1.4x and 2x teleconverter - if that helps.