<p>I think it's just a natural progression from aps-c.<br>
Going ff isn't that expensive over the aps-c, I mean its just the diff of a proper L lens, yet upgrading to the ff sensor makes all your current lenses that much better. Personally I think it's totally worth it.<br>
No more FoV calculation, superior iso performance and shallow dof are more than enough reason to me.<br>
Now whether or not one should consider that in lens purchase, well it depends....if someone is satisfy with kit lens or a tamron 2.8 zoom, then I guess no? If you are someone who is never satisfy and always looking for the best, then buying ff compatible lens makes sense.</p>