I was looking at seatguru the other day and noticed that they don't depict the 757's quite right so I thought I'd share that here. I have not been on the Hawaii birds yet (the second 757 listed as Vers. 1 with 14F seats) so I cannot speak for their accuracy but do have comments about the rest.
As fets answered before, seat 3D is there on all Envoy equipped 757's and is saved as a crew rest for longer flights. Domestically though, 3D is available and have seen people seated in it many times. However, I haven't been assigned it before so I don't know how you would go about getting it.
Like I mentioned in an earlier post, the first 757 Vers. 1 with 8F seats is no longer a configuration that US uses.
They got a couple things mixed together on Vers. 2 and 4. For Vers. 2 there is a lav instead of seats 5 ABC so 4 ABC have no/very reduced recline. The rest of Vers.2 is correct. Vers. 4 does have a 5 ABC so row 4 has regular recline unlike what they have listed and row 5 will have the reduced recline. The rest of Vers. 4 is correct. (with exception of 3D not being shown.)
I would like to revise what I said before about all Envoy seats being equal on this aircraft. I would advise against row 3 because of something that happened last month. They frequently put families with small children in row 4 and the bulkhead there stops about a foot and a half before the floor. A small girl, about 4 years old, had crawled under the bulkhead while her mom was asleep. I was in seat 3C fully reclined and fully asleep when I woke up to this girl, standing behind 3A, yanking on my winged headrest. Hey, kids will be kids and it's probably a rare occurrence, but I'd say if another row is available then go for it.