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Performance wise, fuck-all difference.
Only exception is slightly lighter and alu cog carrier that reduced stress on alu freehubs body, whether 105 have just the one on the three largest sprocket.
You can use 105 on alu freehubs body if you don't mind it getting mark on it, and even if there is mark on the body, it's still fine to ride.
Any point in getting a 6800 cassette over a 5800 cassette other than grams?