My thoughts
Cabarkapa seems to be more of a slasher than a shooter. He did make a couple of outside shots, but he got most of his points going to the basket. He is quick and aggressive and not a bad leaper, so all of those things are good. Certainly he isn't strong, but overall he's much more athletic than I suspected. The scouting reports that said he's afraid of contact seem to have been wrong -- I didn't notice anything like that. When he gets the ball, his instinct is to go the hoop, and he has a lot of ways of getting there. I hope he turns out to be a better shooter, because otherwise defenses will lay off of him, the same as they do against most of the team on the perimeter.
It was difficult to evaluate anyone's defense, because the Suns were in a zone a lot of the time and the Knicks were bombing away from the outside. Cabarkapa wasn't very good at closing out on Lampe once Lampe got hot, but he moves his feet well and is aware of what's going on. I don't think he'll be too bad defensively, but I wonder whether he'll be strong enough to guard elite power forwards (or centers). He should be okay guarding small forwards, even fairly quick ones.
Barbosa looked awful. His shot is very flat, and he looked uncomfortable even at the free-throw line. He's quick enough, and maybe there are days when his flat, ugly shot goes in, but I have to say he did not make a good first impression at all.
Tsakalidis seemed heavier. Some of it may have been in his upper body, but a lot of it appeared to be around his midsection. But his footwork was a little better and he was anticipating things under the basket better. He's not an offensive option, but I think he can be a defensive presence, if the coaching staff will use him, which of course they won't.
Joe Johnson looked the same. He has a nice-looking shot that doesn't go in quite as often as it should, and he tends to be passive. We all knew that.
Jacobsen also looked the same, although maybe a little smarter overall. In the summer leagues -- I remember this also from last year -- he comes across as a decent player. The Suns had him running the offense (instead of Barbosa) to open the game. At this point I'd have to say that he's ahead of Barbosa on the point guard depth chart (yes, I said point guard).
I don't know whether Voskuhl has been added to the roster, but he didn't play.
Of the unknowns, Felix had a nose for the ball, but his free throws were bricks. Ellis had a good looking shot. Hart looked terrible. Nothing about the other players seemed to merit discussion.
One thing I will say, though. If the Suns go with a lineup of Stoudemire/Cabarkapa/Marion/Johnson/Marbury, and if that lineup can defend at all, they will run the other team out of the building.