NYC-based filmmaker Casey Neistat recently compared a $35 clip-on smartphone lens with a $7,000 DSLR (the Canon EOS-1D X Mark II to be precise) and superzoom lens. The results, to no one's surprise, were not in the smartphone lens' favor.
However, Neistat expresses surprise at the (admittedly very minor) capabilities of the cheap lens, saying, "So, I very gently, very reluctantly, recommend this total piece of sh*t $35 lens because it sort of almost works. "
That recommendation is given to potential buyers who need something to use with a smartphone. If a more capable lens and camera are within budget, the resulting content will benefit greatly from them, as the comparison screenshot below pretty clearly demonstrates: