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Yeah, I had a sliding nikkor 80-200 F/2.8 that sucked in dirt... I stick to primes as much as possible these days... less moving parts....
If I had the choice of the 50-500 sigma or the 100-400L, I'd say there was no choice... just one option, the 100-400.... I've had sigma lenses, and whilst my 170-500 sigma was a really really nice, sharp lens, it just wasn't L glass... focusing was painfully slow compared to the 400 prime, or the lightning 70-200F/4
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