This is something that is always on my mind when there is an f(x) comeback.
I love these groups equally so this isn't saying anything negative about them! It's simply remarking on how SM makes them have very similar styles :)
See for yourself:
4 Walls vs View
f(x)'s comeback that came out recently reminds me a lot of SHINee's View. It's the same color scheme, angles, and general sound in the verses.
Rum Pum Pum vs Juliette
This is just as SM thing to use the same set constantly, but the whole structure of these songs are the same.
Electric Shock vs Lucifer
Both of their strengths is their ability to have high energy songs with insane choreography and I think these are two songs that show it!