Denmark might be a more interesting comparison.
Lot's of testing, and a population that's following sensible government guidelines.
There's a common myth and misconception regarding Sweden that there was little to no change in daily life and that the government did little or nothing in mitigation actions. Sweden took
considerably less aggressive mitigation actions than other countries, particularly at the national level. However, Sweden did take some government actions, such as imposing limits on the size of gatherings, banning visits to nursing homes, and new regulations on bars and restaurants, to mitigate the spread. Generally, however, Sweden relied much more on advice and voluntary efforts than did other similar countries. Daily life in Sweden did change, though not to the extent seen elsewhere.
And you're right, the most useful comparisons for measuring success would be other Scandinavian neighbors. Here's how the results of Sweden's less aggressive efforts compare.
Deaths per 100,000 Population: Sweden = 58.12, Denmark = 11.73, Norway = 5.23, Finland = 6.36. The nearest EU neighbor is Germany which shares a border with Denmark. Deaths per 100,000 Population in Germany = 11.82.
The Case to Fatality Ratio: Sweden = 5.7%, Denmark = 1.9%, Norway = 1.7%, Finland = 2.6%, Germany = 2.7%
By comparison, the U.S. Deaths per 100,000 Population = 67.14 and Case to Fatality Ratio = 2.7%
https://coronavirus.jhu.edu/data/mortality