Prior hit a superb unbeaten 110 to salvage a draw against New Zealand in Auckland and avoid a series defeat. It was the 31-year-old's seventh Test century and capped another excellent series with bat and gloves that further cemented his status among the game's elite performers.
Robinson, Sussex's professional cricket manager, told Press Association Sport: "He has had a fantastic winter and an especially fantastic series in New Zealand."
He added: "He is world class and has grown every year. He is vice-captain, has stature in the team and he is revelling in that responsibility.
"He has earned his stripes to be seen as one of the best wicketkeeper-batsmen in the world by a country mile."
Prior's hundred, which came after two half-centuries in the series, saw him finish as England's highest runscorer against the Kiwis with 311 at an average of 103.66. He also claimed 10 catches.
And before Christmas he scored 258 runs at 51.6 in the series win in India.
What especially impresses Robinson is his ability to adapt his innings to various match situations.
Robinson said: "He could bat five, six or seven. When England are in trouble he can counter-attack and get them up to a score and when they have got a big score he tops it off beautifully.
"When you look at his record now he has got runs everywhere. He has scored runs in India on turning wickets, against South Africa with their all-pace attack - against teams with all types of bowlers on all types of surfaces."
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