From what I can remember looking at the Tikka compared to the Sako is that,

#1- Sako has a metal clip where as the Tikka has a plastic clip.

#2- Sako clip holds more rounds.

#3-The Sako has a 3 locking lug bolt compared to 2 locking lug bolt from Tikka.

#4-The Tikka has one action fits all compared to the Sako 75 with 4 actions to suit 4 different length cartridge.

#5-I find the stock on the Sako to be made of better quality material with the soft rubber
grips.

#6-The action on the Tikka is made with some plastic parts compared to all metal parts for Sako.

Similarities-They both have the same quality barrels with the same accuracy spec. Both have adjustable triggers. Both have 70° bolt lift. Both can use the Optiloc base and rings. I may have missed somethings but this is what I can come up with. Sorry bugsNbows if I repeated somethings...