It's in all the small details.
Beyond the smooth action and fit/finish people rave about, I find Sako's to be better thought out than almost any other factory offering. For example, I find a detachable box magazine preferable to a floorplate and Sako offers the best in the business in my opinion. While a Tikka .308 3rd magazine protrudes below the stock, the 5rd Sako equivalent is flush with a retention feature making it impossible to accidentally drop. Similarly, factory trigger's on all of the Sako's I've tried are excellent and don't need to be refined by a gunsmith or replaced. I am also a huge fan of the safety on the 85 models, where the safety is either on or off, no three position nonsense, but if you wish to operate the bolt while safe you still can by pressing the bolt override.
If you couldn't tell I'm a Sako fanboy, however, even I'll admit it isn't perfect. I've heard some long action 85's have ejection problems with certain cartridges though I've never seen or experienced it myself. The synthetic stock materials used, at least on the Finnlight and Black Bear, feel a bit cheap when compared to the competition though are very functional. And finally, I'm ambivalent about the dual dovetail scope mounting; some love it, some hate it.
Back to the stock. While I wish the Black Bear stock was a bit nicer in materials, it is the best shouldering rifle I've ever held and the irons are effortless.
If tinkering is your thing a Sako probably isn't your jam. If buying a gun to get a job done with minimal fuss is your thing, buy a Sako and be done with it. My only regret about my 85 Black Bear is I didn't buy earlier.