IQ is a terrible metric because "raw" intelligence is only one skill required to be a developer. It discounts creativity, people skills, personality, drive, domain knowledge, style, and learning speed.
If I got a candidate with a 140 IQ who was unpleasant, derisive, and had only coded in Pascal, I'd send them packing. It speaks to their drive, personality, and people skills.
A winning team is not built on intelligence alone.
Unfortunately, unless you also have a similar iq, the candidate will naturally seem unpleasant to you. Anyone would agree that they would not like to be around someone with an 80 iq. however for the same reason, namely differing values, attitudes, and thought processes those same people will not enjoy working with a 140 iq coworker.
If I got a candidate with a 140 IQ who was unpleasant, derisive, and had only coded in Pascal, I'd send them packing. It speaks to their drive, personality, and people skills.
A winning team is not built on intelligence alone.