Income categories are paying almost exactly the same share of federal taxes as before. Millionaires actually pay a tiny bit larger share in the new bill.
That is from John Cochrane, drawing on Greg Mankiw, with the source being the Joint Committee on Taxation. I would say that media coverage of this bill — which does have many objectionable features — has been somewhat less than ideal, most of all on the issue of redistribution. Overall, claims about redistribution — from either side — are much more likely to be wrong or misleading than claims about most other topics.