I really must put a word in for Dickens. I'll take Dickens' huge, sweeping canvases over all social strata with characters from all social classes in Bleak House, Our Mutual Friend , Great Expectations and Little Dorrit over Austen's genteel drawing rooms any day.
I think Bleak House is one of the greatest novels written in English. The structure is like nothing written before- a huge panoply of characters ranging through all sections of society from Jo the homeless street child to the aristocratic Dedlocks and set in locations from the Dedlock country estate to the horrific slums in the Tom-All-Alone's rookery and everything in between. There are complex separate narrative strands told by 2 narrators , which never fully intersect but run in parallel. It is a brilliant book. Yes the death of Jo is sentimental, it's also very moving.
In Our Mutual Friend Dickens makes amends for Fagin in the sympathetic Jewish character Riah who is as good as Fagin was bad.
As for Fagin, Oliver Twist, as was the norm, was published in parts. A friend of Dickens, Eliza Davis, complained about the numerous references to "the Jew" and Dickens stopped the printing. The text was amended and although Fagin is referred to as "the Jew" 257 times in the first 38 chapters, this is barely mentioned in the next 179 references.
The other famous accusation of sentimentality is the death of Little Nell- which occupies a tiny proportion of the book. There is nothing sentimental in Nell and her grandfather's nightmarish journey through the heavily industrialised Black Country to the peace of the village where she dies.
The description of Dotheboys Hall in Nicholas Nickelby is harrowing, especially knowing it was based on the real- life scandal of the Yorkshire boarding schools where unwanted illegitimate or handicapped children were sent , basically to be forgotten. Dickens may have sentimentalised Smike, a real life Smike would have been horribly brutalised by the treatment he receives , but there was a purpose to that. Smike had to be a sympathetic character.