Why do Peter Mckinnon & Casey Neistat use the 16-35mm vs 24mm 1.4 L ? [16-35mm 2.8 vs 24mm 1.4 for Vlogging]

Why do Peter Mckinnon & Casey Neistat use the 16-35mm vs 24mm 1.4 L ? [16-35mm 2.8 vs 24mm 1.4 for Vlogging]

Which is better?

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