Here some impressions i cannot entail nor contradict, but which shows how underestimated is this Spanish master of piano :
«As Richard Williams has observed, Montoliu is a far more interesting pianist today than Oscar Peterson – harmonically more resourceful, more given to subtle humour and with a greater range of mood and tonal colour. Though he has developed in sophistication and technical command over the years, he remains a player of instinct and impulse and his dexterity and clarity of execution are tools waiting to do the bidding of his inventive mind.»
https://jazzjournal.co.uk/2021/08/29/jj-08-81-tete-montoliu-trio-at-ronnie-scotts/