They say you get what you pay for, and when it comes to goalkeepers, Liverpool have found out the old adage holds a lot of truth.
Last season's No 1, Loris Karius, arrived from Mainz in a cut-price £5.5million move, but never truly convinced before his disastrous display in the Champions League final saw Jurgen Klopp move for Alisson.
The former Roma goalkeeper arrived at Anfield in the summer for a then-world record £67m, and in the six months since has proved to be worth every penny.
His stoppage time save against Napoli on Tuesday night sent Liverpool through to the Champions League knock-out stages, and turned the Brazilian into a social media sensation.
It was the 54th save Alisson has made for Liverpool so far - and his most important - which is only four less than Karius has made in his Reds career.
This is despite Alisson thus far having played in 11 fewer games than the German, now farmed out on loan to Besiktas for two years.
Comparing the stats, Alisson comes out looking better than Karius in practically every available metric, from goals conceded to passing accuracy.
With the Brazilian as adept at playing out from the back as fellow countryman Ederson at Manchester City, he has been on target with 469 passes in 22 games at a rate of 77.7 per cent success.
Karius may have played more successful passes - 567 - however this was over the course of 33 matches, and only with an accuracy percentage of 61.3.
In terms of clean sheets, the two are fairly well matched, having kept them in just around half their Liverpool games - 16 in 33 for Karius, 12 from 22 for Alisson.
However the other main success indicator for a goalkeeper is goals conceded, and here Alisson leaves his predecessor well behind.
He has conceded just 13 goals so far, at a rate of just 0.59 per match. Karius meanwhile was beaten on average nearly once every match - 31 in 33.
While Alisson may be benefiting from a more restrained Liverpool this season, rather than the all-out attacking force we saw in 2017-18, the perception of him being a significant upgrade in goal certainly seems to be borne out.
Karius and Alisson are both young for goalkeepers - 25 and 26 respectively - and both have the potential to have long and successful careers.
In terms of which of those careers will be spent as No 1 at Liverpool, however, there appears to be only one winner.