Zooming and Exposure compensation

Hi,
My first steps with a 6440..., would like to ask.

There are some shots I took to the sea (landscape mode), near the sunset (but not to the sun) , there was enough light. I was full zooming to close-up a ship in the horizon. Those shots got a little underexposed. The effect is just like it would have been taken an hour later. They don´t look bad trust me, very nice, but shifted in time.

I have another indoor situation that when full-zooming I ended in low light situation. Then, is there a well known fact that zoom lenses when in the tele-end need to be helped in the camera with a little of exposure compensation?. May I have taken that sea shot getting the correct "time of day" if adding +1EV for example?
best regards you falks,

The 6440 has a Schneider-Kreuznach Variogon 4x (33-132mm equiv.)