If everyone were using equal information to reach a logical conclusion, the conclusion should be the same; because logic is a process, and if someone uses it correctly, it's the same as any other mathematical process.

Example: On a question like, "Should I quit my job?"... Suppose there are 20 pieces of critical information needed to come to the most logical decision.

If I ask 100 people the question I'll get x number saying "yes" and x number saying "no".

Suppose I add in the information that I have a mortgage, or that, instead, I am independently and vastly wealthy. The numbers of yes's and no's would change. What if I add that I'm 25? How about if I add that I'm 85? Suppose I add that I have 10 kids. Suppose I add that x number are under 16. What if, instead, I have 10 kids over 40 years old? What if I change the question to "should I quit this month or next year?"

The person who had knowledge of all the critical pieces of information could reach a logical conclusion, provided that person was good at using logic. Two people equally skilled at using logic would reach the same conclusion. (Remember that logic is independent of people's personal preferences, emotions, experiences, etc.)

With only the initial question nobody would have sufficient information to come up with a solid, logical, answer; so they'd have to just go by their own leanings/preferences.