One could apply the same logic to laptops after using a macbook pro retina, and say why are there no good Windows laptops? Retina macbooks have been out for a year now and nobody else comes close yet except for GPU performance.
There are a few laptops that have HD resolution displays in a 13 inch or smaller chassis - the Asus Zenbook comes to mind. And there is even the new Toshiba laptop with a better than retina display.
And these things are available here in SA.
Thats the thing - its not that no decent Android tablets exist, its that none of them are available here, and thats mostly because Samsung hasnt made any yet.