[Zhang Fei]

Point us that genetic differences amongst humans are relatively small, and even though evolution (or de-evolution if you prefer) continues every day, we are still much more alike than different from each other.

That goes without saying. That's why interracial procreation can occur without systematically producing sterile offspring. On the other hand, the tiny differences are sufficient to account for great differences in mental and physical ability, just as they are in other species. And to put things in perspective, pigs and humans are said to have 98% of their genes in common.

[BroJoeK]

Pigs & humans are not 98% the same genetically, by any measure.
But it's true that such numbers largely depend on exactly what & how you measure.
By carefully selecting your criteria, you might get pigs up into the 80+% range.

As for future genetic engineering, that is of course a whole another kettle of fish.

[BroJoeK]

A google search turns up the following report on percent of identical DNA between humans and various others:

1. 99.9% the same amongst all humans = 3 million base pair differences out of 3 billion total.

2. 99.8% the same between modern humans and Neanderthals.

3. 94% the same between humans and chimpanzees.

4. 90% the same with cats.

5. 80% the same with cows & pigs.

6. 75% equivalents with mice.

7. 60% correspondence with chickens and, curiously, also with fruit flies.