They're both k-drama action. If you liked this then you'll certainly like IRIS but I can't say it'll be the same vice-versa. They are both big budget productions but IRIS is certainly way better in its execution.
Both male leads at 'Healer' and 'A Man Called God' are badass with extraordinary skills. they both have a small team who helps them and the female lead is also a reporter. There is a need for revenge and lost relatives too. There is romance in 'A Man Called God', but it's mainly action while 'Healer' is more romantic.