The answer
The apostles had a relationship with the Holy Spirit because the Holy Spirit - according to the Creed - was the One who 'spoke through the prophets'.
But the relationship that the Lord Christ had with the Holy Spirit was hypostatic and quite distinct from that of the apostles or anyone else with the Spirit. This is because Christ's relationship with the Holy Spirit is eternal, and is based on equality.
Christ's relationship with the Holy Spirit existed before the creation of the world, before all ages, before time and from
infinity, while none of the apostles had this same kind of relationship.
Christ abides in the Holy Spirit, and the Holy Spirit abides in Him, and both are ever-present in their mutual essence. They are of the same nature. This is the point on which Christ differed from all others in His relationship with the Holy Spirit.
Then again it was Christ who sent the Holy Spirit to the holy disciples, so that it came upon them on the day of Pentecost, and gave them the gift of speaking in tongues. None of the apostles could ever have said that he had sent the Holy Spirit.
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Thrice-Blessed Pope Shenouda III of Blessed Memory