How do you measure intelligence? If we take an IQ score as the measure, we will will see that many individuals with high recorded IQ, are not that remarkable when it comes to their activities. Usually they don't make huge advances in any fields, or become ultra rich.

We don't know if humans are 1000 times smarter than rats. Maybe we are 10 times smarter, or a 1000000 times. We don't know how much smarter Perelman or Obama is than a Joe Sixpack. We don't even know what "smarter" means. So talking about some hypothetical "sentient entities", and how "smarter" they can be compared to anything, is a bit premature, IMO.