Maybe, but imo Iran giving away a sample to China for sole exchange of money from it is a non win-win for Iran, China doesn't even let us buy modern J-10 fighters beside J-10A which is completely obsolete
A win-win would be Iran giving away some of them for study and reverse engineering in exchange of being able to purchase Chinese aircrafts (just for having a ticket to buy something), and even this would not be win-win as any country in the world can buy Chinese aircrafts without needing a ticket besides Iran, being the guinea pig for Z-53 would also mean having access to the product reversed immediately when exports are available
If their proposal was a good old sack of gems/gold/cash i can see why Iran shut off the door to such demands
China has experienced a tremendous progress in aviation, its true. They have developed high tech and reliable engines based upon Russian platforms. WS- family of Turbofan engines for instance.
But they do not stand where that may make Iran ask for their fighter jets. The experience that we had from the 8 years war, tells us that western fighter jets were and are light years ahead in technology unfortunately.
My own ranking based on that experience would be
1- USA
2- Russia
3- France
4- Other European products from UK/Germany to Swediah platforms
5- China
That's a harsh reality. Which made Iran never consider Chinese fighter jets again, except for possibly tech transfer from China.
Reason is, there is no technological disadvantage on Iranian side, Iran maybe lack budget and industrial capacity of mass production but it doesn't lag behind China technologically. We can make what they have made with delay because of a couple of reasons.
About refusing to buy Chinese platforms, you just need to ask yourself, which Chinese fighter jet can give us something that F-14s of IRIAF lacks already that may persuade IRIAF leadership to spend their limited budget to get them? Radar range? A2A or A2G capability? Iran has upgraded radars of its F-14 fleet adding them ground attack capability. And unlike communist countries, Iran doesn't care about quantity that much. Cost-effective, yes, but cheap NO.
People keep posting about SU-35 and Chinese fighter jets, maybe even European ones. But they forget that Iran wants a jet that actually adds something to its existing capabilities. Importing from multiple sources will make an other century of maintenance nightmare for Iranians.
So no thanks, we don't want foreign assets that adds nothing but trouble.