The fastest civil turboprop now in production seems to be Piaggio Avanti. Maximum speed said to be 732 km/h, cruise speed 593 km/h.

A400 cruise speed is supposed to be 780 km/h (Mach 0,68…0,72)

Tu-114 has maximum speed of 870 km/h and cruise speed 770 km/h.

Tu-114 is loud. But how loud is A400?

Certified!

What we missed is that Superjet is certified:
http://www.flightglobal.com/articles/2011/01/28/352506/superjet-100-secures-russian-certification.html

ARJ21 or C919?

Syrianair is, I think, pursuing the best option open to both the them and the Iranians in talking to the Russians. IMO I would not rule out the possibility that the Chinese will be able to offer alternative engine options for their jetliners in the future. In fact I wouldn’t rule out anything concerning China and its aerospace industry

Future, yes. But not imminently. Whereas Russian engines now exist.

very prettyful jet. but doesn’t this, MS-21 and An-148/58 all after the same regional airliner market? tough

Not MS-21.

Superjet 100-95 was evacuated with 98 seats. And the MTOW is slightly over 49 tons, for the heaviest version. Whereas the smallest MS-21, MS-21-200, has MTOW of 67,6 tons and 162 seats in densely packed layout. MS-21 is competing with mainline narrowbodies like B737 and A320, not with regional jets.