First off, don't misunderstand my post. The tikka is a great rifle. They shoot great, they are light, have a great trigger and are quite affordable.
That said, the sako is all steel, it has a superior recoil lug arrangement, it has a 3-lug bolt which is also 1-piece, and a mechanical blade ejector - not a spring loaded plunger like tikka. They are also made to fit the cartridge length, not one size fits all like the tikka.
The tikka has more aftermarket parts available - but the majority of them are simply replacing the factory plastic parts (that the sako doesn't have.) If the OP bought the tikka, swapped out the shroud, bottom metal (plastic) and aluminum lug he would have more in the tikka than the $200 more the sako costs and it's still a tikka.
They are made by the same company yet sold roughly $800-1000 apart - that should tell you something.
This is of course only my opinion.