The phrase "are often far less" is correct and usable in written English.
It can be used to compare the degree or extent of something, indicating that it is usually significantly lower than another reference point.
Example: "The costs of living in rural areas are often far less than those in urban centers."
Alternatives: "are frequently much lower" or "are typically considerably less".
"Slums are often far less dangerous than believed.
A similarly elastic approach can be seen in his buildings, which are often far less nostalgic than they appear.
However, for physically small cracks: here defined as less than a few mm in depth, such predictions are often far less accurate.
However, theatre and theatre organisations are often far less open to casting learning disabled actors and integrating them into productions than TV, hence Hughes's sharp words and the need to keep challenging the assumptions made about disabled performers.
One of the problems now facing American counterterrorism experts is that they say communications intercepts, while vaguely worded, are often highly credible threat warnings, while the very detailed and specific threats passed on by individual informants are often far less reliable.
There are millions of people with houses or apartments that have rooms sitting empty, and Airbnb allows them to profit from these empty rooms while allowing guests a place to stay at prices that are often far less than those charged by hotels.
But their plight is often far less acknowledged.
In truth, medical care is often far less effective than most believe.
But the economic arm of police militarization is often far less visible, and offender-funded justice is part of this sub-arsenal.
As party literature laments, however, this is often far less about love for the Communist cause than it is about burnishing credentials.
X Factor asks you for extremes of emotions to put into cover versions of songs whose originals were often far less overwrought.
