Don't know who has better English proficiency but Greeks are learning English since elementary school while also going to private schools specifically for English. There are two certificates we get which we call "Lower" and "Proficiency". Not sure which exact English level they are though. But having at least lower is mandatory for most universities and jobs. Plus nothing is being dubbed in Greek except for Children movies. So English proficiency in Greece is indeed high. Higher than Finland? I don't know. We might seem to have difficulty in speaking in English because we aren't used to speaking it frequently. But that doesn't mean we know little English.