It is obviously way more difficult for Xavi in Qatar than it was for Guardiola in Barcelona B, while Guardiola faced off with regional managers the likes you have never heard of in a league completely comparable with the English Conference. Xavi is facing of with high level managers in Qatar only there because of ridiculous salaries, guys like Laurent Blanc who won the French league with both PSG and Bordeaux and coached the French national team in Euro 2012. Please name one single manager that Guardiola had to deal with in Tercera Division even worthy of carrying the water bottles for Larent Blancs team.
Some of the managers Xavi had to beat to win the Qatar league last season when he finished with 19 wins and 3 draws
Laurent Blanc (French 1 division champion 4 times with Boreaux and PSG)
Slavi?a Jokanović (Watford, Fulham and Sheffield United) who promoted Watford to the Premier League, winning 15 of the last 21 games
Luis Castro who spent 20 years in Portugese football including coaching FC Porto before going to Ukraine winning the league with Shaktar
Heimir Hallgrimsson who as assistant coach to Lagerback took Iceland to the first ever Euro finals beating England to reach quarter finals, then took over as head coach and qualified Iceland for the World Cup finals for the first time ever.
Tintin Marquez who coached Espanyol in Primera Division against Guardiola and notably drawing away to Real Madrid, one of very few times Espanyol ever took a point at the Bernabeu stadium