I've been comparing the same events written across different gospels recently, and although I was aware of the differences between the gospel accounts of Jesus's very last moments before death I really was stuck when I started to look at them in depth.
Mark and Mathew are very similar, though once you get to Luke, then John seem to diverge.
At noon, darkness came over the whole land until three in the afternoon. And at three in the afternoon Jesus cried out in a loud voice, “Eloi, Eloi, lema sabachthani?” (which means “My God, my God, why have you forsaken me?”). When some of those standing near heard this, they said, “Listen, he’s calling Elijah.” Someone ran, filled a sponge with wine vinegar, put it on a staff, and offered it to Jesus to drink. “Now leave him alone. Let’s see if Elijah comes to take him down,” he said. With a loud cry, Jesus breathed his last.
From noon until three in the afternoon darkness came over all the land. 46 About three in the afternoon Jesus cried out in a loud voice, “Eli, Eli,[c] lema sabachthani?” (which means “My God, my God, why have you forsaken me?”). When some of those standing there heard this, they said, “He’s calling Elijah.” Immediately one of them ran and got a sponge. He filled it with wine vinegar, put it on a staff, and offered it to Jesus to drink. The rest said, “Now leave him alone. Let’s see if Elijah comes to save him.” And when Jesus had cried out again in a loud voice, he gave up his spirit.
It was now about noon, and darkness came over the whole land until three in the afternoon, for the sun stopped shining. And the curtain of the temple was torn in two. Jesus called out with a loud voice, “Father, into your hands I commit my spirit.” When he had said this, he breathed his last.
Later, knowing that everything had now been finished, and so that Scripture would be fulfilled, Jesus said, “I am thirsty.” A jar of wine vinegar was there, so they soaked a sponge in it, put the sponge on a stalk of the hyssop plant, and lifted it to Jesus’ lips. When he had received the drink, Jesus said, “It is finished.” With that, he bowed his head and gave up his spirit.
Its easy to reconcile many events in the gospels using telescoping (they just skipped over large sections of time, without mention) but here they are talking about such discrete moment in time that its hard to use that explanation. Also, there is a clear cause and effect sequence, especial with Luke ("When he had said this...") and John ("With that..."), its hard to reconcile.
Is there an answer other than at least two gospel writers just got it wrong? Or they weren't reporting on Jesus's actually words but only making theological points?
And a secondary question is, if presumably Luke had a copy of Mark when he was writing and perhaps a copy of Matthew as well, then why would he deviate when it was right in front of him? And of course John may or may not have had a copy of any of the others in front of him.