Its complicated. The fixed basic pension in Sweden is around the same as the UK, there is then an income related element which you opt into, the more you get paid and hence pay in the more you get back in pension at retirement. The max that this can reach is around 50k SEK or 4k per month. There is then another final bit which is supplementary insurance which you can pay into as a pension.
To get the £4k per month you would need to be on a high salary, above the threshold what would constitute a higher rate tax payer in the UK. You certainly dont get it if you are on a minimum wage or have been unemployed.
But you do pay in considerably more than NI contributions and they also dont pay the basic pension to element if you choose to live outside of Sweden. So if you want a retirement of fun in the sun, you have to ensure you have been earning a big wage for a long time whilst in Sweden or have money from somewhere else. Hence the lack of a TV programme called "Bargain Loving Swedes In The Sun".