There is exactly the same weld on all 749 / 999 tanks but you don't see it as it is covered by a small plastic plate , the plate would look silly on the bigger tank , I don't have a problem with it being left off.
As someone else also posted , what hefty price premium ?
, the 749R is quite a bargain when you consider what you get for your money , same frame as a 999R , same swingarm as a 999R , brakes forks , magnesium rocker covers , carbon bodywork (ok the seat is plastic) unique engine bore / stroke compared to other models , you even get titanium valves which the 999R does not have..........all for £6k less than a 999R