The phrase "are generally far less" is correct and usable in written English.
It can be used to compare two or more subjects, indicating that one is significantly lower in degree or quantity than the other.
Example: "These new models are generally far less expensive than their predecessors, making them more accessible to consumers."
Alternatives: "are typically much lower" or "are usually considerably less".
Indonesia's Islamic boarding schools, known as pesantren, are generally far less militant than the equivalent institutions in Pakistan.
In our current literary culture, we're used to encountering allegiances based upon a writer's gender or race or sexual orientation, but ties of geography are generally far less compelling.
The United States continues to list some countries in these regions -- most notably Iran, Iraq, Libya and Syria -- as "state sponsors" of terrorism, but acknowledges that they are generally far less active today than in the past.
As he notes, the Americans attracted to jihad in recent years are generally far less formidable — amateurs with no military background, few technical skills and scant knowledge of Islam, though there are exceptions.
The multimedia occurrence of PCDD/Fs globally in industrialized countries is fairly well documented; however, data are generally far less common than for other chemicals such as PCBs and organochlorine pesticides.
Prices are generally far less than buying from a grocery store.
The information is generally far less than what appears on the museum's labels.
The cost for these places is generally far less than that for a luxury spa or hotel.
But now I'm at Esquire there is generally far less pressure on my flat to look perfect.
Taft certainly showed little interest in coöpting the McClure's crowd, and he was generally far less concerned than Roosevelt was with broadly disseminating his ideas.
The virtual exam is comparably effective to colonoscopy for the overwhelming majority of Americans and is generally far less expensive than standard colonoscopy as it does not require sedation or an anesthesiologist.
