Wishing Harry so much success!
Honestly I don't understand the 1D competition, in this industry there's opportunity to all the 1D members to shine and succeed if they come out with great music. The Beatles had Paul M and John Lennon.
Disney: Selena G, The Jonas Brothers, Miley and Demi came from there and every one of them is successful.
Same could happen with 1D.
I think Harry and Zayn are very different musically, Zayn competes more with the Weekend, Justin Bieber and Harry will compete with ColdPlay, Likim Park and other rock/alternative singers.
I think Zayn and we all know from the beginning that Harry was the most popular member of 1D, so I think Zayn was really surprised by his solo success, plus he didn't have the pressure to prove something. I think he beat all the odds cause he did what Harry is expected do achieve next week.