Just my $0.02, but I don't see the G4 selling well because of fierce competition from Apple and Samsung. That, and maybe LG still leaves a bad taste in people's mouths from the Optimus G days of dysfunctional SMS.
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You can force it sooner with an app called LTE Discovery. Only the paid version resets your connection in the background, but in my area, it's absolutely worth it.
Just ran through the NW burbs (Cary, Schaumburg, Itasca) down to Oak Lawn, Alsip and Midlothian with Band 25 disabled on my M8. Solid coverage on B26 and B41 the whole way. I wish I had this experience west of Crystal Lake.