Evidence in the film? Some, but not much. All bad.
Roy is described as a
Combat model. Optimum self-sufficiency. ("Colonization Defence").
It seems likely that his role was either to put down mutinies amongst the colonists, or to protect the colonists against uprisings by the replicants. Either way it's not a bed of roses up there if they need super-soldiers to stop the place from tipping into anarchy.
Zhora is described as a
"Kick Murder Squad" assassin.
Given how openly this is stated, it seems highly likely that her role was to infiltrate and kill the leaders of insurgencies against the colony's leadership.
Beyond that there's not a whole lot to go on but it doesn't sound great.
Evidence in the source novella? Some, not great. Better than Earth.
After the owls, of course, the other birds followed, but by then the
mystery had been grasped and understood. A meager colonization program
had been underway before the war but now that the sun had ceased to
shine on Earth the colonization entered an entirely new phase. In
connection with this a weapon of war, the Synthetic Freedom Fighter,
had been modified; able to function on an alien world the humanoid
robot — strictly speaking, the organic android — had become the mobile
donkey engine of the colonization program.
Under U.N. law each emigrant automatically received possession of an
android subtype of his choice, and, by 1990, the variety of subtypes
passed all understanding, in the manner of American automobiles of the
1960s. That had been the ultimate incentive of emigration: the android
servant as carrot, the radioactive fallout as stick. The U.N. had
made it easy to emigrate, difficult if not impossible to stay.
Loitering on Earth potentially meant finding oneself abruptly classed
as biologically unacceptable, a menace to the pristine heredity of the
race. Once pegged as special, a citizen, even if accepting
sterilization, dropped out of history. He ceased, in effect, to be
part of mankind. And yet persons here and there declined to migrate;
that, even to those involved, constituted a perplexing irrationality.
Logically, every regular should have emigrated already. Perhaps,
deformed as it was, Earth remained familiar, to be clung to. Or
possibly the non-emigrant imagined that the tent of dust would deplete
itself finally. In any case thousands of individuals remained, most of
them constellated in urban areas where they could physically see one
another, take heart at their mutual presence. Those appeared to be the
relatively sane ones. And, in dubious addition to them, occasional
peculiar entities remained in the virtually abandoned suburbs.
Do Androids Dream of Electric Sheep?
Evidence in the follow-up novel? Loads. All bad.
That's what the U.N. authorities, the ones in charge of the off-world
colonies, have gotten into such a sweat about. Only they can't come
right out and admit that they screwed up, that their entire strategy for making
the colonies attractive to potential settlers is a disaster, that it
leads to garrison states, like ancient Sparta armed to the teeth
against its own helots -- or else fields of bones on other planets, if
the replicants manage to pull off a successful rebellion and the U.N.
has to send in a military unit to sterilize the place, keep the
infection from spreading. There's all kinds of things happening out
there in the colonies that the authorities aren't telling the people
here on Earth. It wouldn't exactly make good recruiting propaganda,
Blade Runner: The Edge of Human