In T6T Mycroft says Sherlock is all sentiment now, but in TLD, when talkin to Mrs Hudson he says Sherlock is pure logic. Wtf?
SOMETHING’S FUCKY INDEED LOVELY.
I think of this as another clue to unreliable narrator, told from two different perspectives. Or Mycroft is just being petty and spiteful and is jealous of his little brother. Either works, LOL.